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Locus and Complex Numbers
Locus and Complex Numbers
Circles
Locus and Complex Numbers
Circles
           y
           R



  R           R   x


          R
Locus and Complex Numbers
Circles
           y
           R



  R             R   x


          R

          z R
Locus and Complex Numbers
Circles
           y
           R



  R                 R   x


          R

           z R
             or
          zz  R 2
Locus and Complex Numbers
Circles
           y                 y
           R
                                     R
                                 
  R                 R   x               x


          R

           z R
             or
          zz  R 2
Locus and Complex Numbers
Circles
           y                  y
           R
                                      R
                                  
  R                 R   x                x


          R

           z R              z   R
             or
          zz  R 2
Locus and Complex Numbers
Circles
           y                          y
           R
                                               R
                                           
  R                 R   x                              x


          R

           z R                    z   R
             or                          or
          zz  R 2            z    z     R 2
e.g. (i) Express these circles in terms of z
e.g. (i) Express these circles in terms of z
a) x 2  y 2  16
e.g. (i) Express these circles in terms of z
a) x 2  y 2  16
     z 4
e.g. (i) Express these circles in terms of z
a) x 2  y 2  16
     z 4
    zz  16
e.g. (i) Express these circles in terms of z
a) x 2  y 2  16                    b) x 2  y 2  6 x  4 y  12  0
     z 4
    zz  16
e.g. (i) Express these circles in terms of z
a) x 2  y 2  16                    b) x 2  y 2  6 x  4 y  12  0
     z 4                                  x 2  6 x  y 2  4 y  12
    zz  16
e.g. (i) Express these circles in terms of z
a) x 2  y 2  16                    b) x 2  y 2  6 x  4 y  12  0
     z 4                                  x 2  6 x  y 2  4 y  12
    zz  16                               x  32   y  22  25
e.g. (i) Express these circles in terms of z
a) x 2  y 2  16                    b) x 2  y 2  6 x  4 y  12  0
     z 4                                  x 2  6 x  y 2  4 y  12
    zz  16                               x  32   y  22  25
                                                     z  3  2i  5
e.g. (i) Express these circles in terms of z
a) x 2  y 2  16                    b) x 2  y 2  6 x  4 y  12  0
     z 4                                  x 2  6 x  y 2  4 y  12
    zz  16                               x  32   y  22  25
                                                     z  3  2i  5
                                           z  3  2i  z  3  2i   25
e.g. (i) Express these circles in terms of z
a) x 2  y 2  16                     b) x 2  y 2  6 x  4 y  12  0
     z 4                                   x 2  6 x  y 2  4 y  12
    zz  16                                x  32   y  22  25
                                                      z  3  2i  5
                                           z  3  2i  z  3  2i   25
(ii) Find the centre and radius of;
e.g. (i) Express these circles in terms of z
a) x 2  y 2  16                     b) x 2  y 2  6 x  4 y  12  0
     z 4                                   x 2  6 x  y 2  4 y  12
    zz  16                                x  32   y  22  25
                                                      z  3  2i  5
                                           z  3  2i  z  3  2i   25
(ii) Find the centre and radius of;
    a) z  5  i  2
e.g. (i) Express these circles in terms of z
a) x 2  y 2  16                     b) x 2  y 2  6 x  4 y  12  0
     z 4                                   x 2  6 x  y 2  4 y  12
    zz  16                                x  32   y  22  25
                                                      z  3  2i  5
                                           z  3  2i  z  3  2i   25
(ii) Find the centre and radius of;
    a) z  5  i  2
      centre : 5,1
e.g. (i) Express these circles in terms of z
a) x 2  y 2  16                     b) x 2  y 2  6 x  4 y  12  0
     z 4                                   x 2  6 x  y 2  4 y  12
    zz  16                                x  32   y  22  25
                                                      z  3  2i  5
                                           z  3  2i  z  3  2i   25
(ii) Find the centre and radius of;
    a) z  5  i  2
      centre : 5,1
      radius : 2 units
e.g. (i) Express these circles in terms of z
a) x 2  y 2  16                     b) x 2  y 2  6 x  4 y  12  0
     z 4                                   x 2  6 x  y 2  4 y  12
    zz  16                                x  32   y  22  25
                                                      z  3  2i  5
                                           z  3  2i  z  3  2i   25
(ii) Find the centre and radius of;
    a) z  5  i  2                     b)  z  4  i  z  4  i   49
      centre : 5,1
      radius : 2 units
e.g. (i) Express these circles in terms of z
a) x 2  y 2  16                     b) x 2  y 2  6 x  4 y  12  0
     z 4                                   x 2  6 x  y 2  4 y  12
    zz  16                                x  32   y  22  25
                                                      z  3  2i  5
                                           z  3  2i  z  3  2i   25
(ii) Find the centre and radius of;
    a) z  5  i  2                     b)  z  4  i  z  4  i   49
      centre : 5,1                           centre :  4 ,  1
      radius : 2 units
e.g. (i) Express these circles in terms of z
a) x 2  y 2  16                     b) x 2  y 2  6 x  4 y  12  0
     z 4                                   x 2  6 x  y 2  4 y  12
    zz  16                                x  32   y  22  25
                                                      z  3  2i  5
                                           z  3  2i  z  3  2i   25
(ii) Find the centre and radius of;
    a) z  5  i  2                     b)  z  4  i  z  4  i   49
      centre : 5,1                           centre :  4 ,  1
      radius : 2 units                         radius : 7 units
c) 3 z  z  2  i
c) 3 z  z  2  i
  3z  z  2i
c) 3 z  z  2  i
  3z  z  2i
  9 x 2  9 y 2   x  2    y  1
                         2           2
c) 3 z  z  2  i
  3z  z  2i
  9 x 2  9 y 2   x  2    y  1
                         2           2


  9x2  9 y2  x2  4x  4  y2  2 y 1
c) 3 z  z  2  i
  3z  z  2i
  9 x 2  9 y 2   x  2    y  1
                         2           2


  9x2  9 y2  x2  4x  4  y2  2 y 1
  8x2  4x  8 y 2  2 y  5
c) 3 z  z  2  i
  3z  z  2i
  9 x 2  9 y 2   x  2    y  1
                         2           2


  9x2  9 y2  x2  4x  4  y2  2 y 1
  8x2  4x  8 y 2  2 y  5
        1           1      5
   x  x y  y 
    2           2

        2           4      8
c) 3 z  z  2  i
  3z  z  2i
  9 x 2  9 y 2   x  2    y  1
                         2           2


  9x2  9 y2  x2  4x  4  y2  2 y 1
  8x2  4x  8 y 2  2 y  5
         1          1      5
    x  x y  y 
      2          2

         2          4      8
           2            2
   x  1    y  1   45
                   
       4         8  64
c) 3 z  z  2  i
  3z  z  2i
  9 x 2  9 y 2   x  2    y  1
                         2           2


  9x2  9 y2  x2  4x  4  y2  2 y 1
  8x2  4x  8 y 2  2 y  5
         1          1      5
    x  x y  y 
      2          2

         2          4      8
           2            2
   x  1    y  1   45
                   
       4         8  64

          centre :  ,  
                     1 1
                        
                    4 8
c) 3 z  z  2  i
  3z  z  2i
  9 x 2  9 y 2   x  2    y  1
                         2           2


  9x2  9 y2  x2  4x  4  y2  2 y 1
  8x2  4x  8 y 2  2 y  5
         1          1      5
    x  x y  y 
      2          2

         2          4      8
           2            2
   x  1    y  1   45
                   
       4         8  64

          centre :  ,  
                     1 1
                        
                    4 8
                  3 5
         radius :     units
                   8
c) 3 z  z  2  i                         d) zz  2 z  z   0
  3z  z  2i
  9 x 2  9 y 2   x  2    y  1
                         2           2


  9x2  9 y2  x2  4x  4  y2  2 y 1
  8x2  4 x  8 y 2  2 y  5
         1           1      5
    x  x y  y 
      2          2

         2           4      8
           2             2
   x  1    y  1   45
                    
       4          8  64

          centre :  ,  
                     1 1
                        
                    4 8
                  3 5
         radius :     units
                   8
c) 3 z  z  2  i                         d) zz  2 z  z   0
  3z  z  2i                                x2  y2  4x  0
  9 x 2  9 y 2   x  2    y  1
                         2           2


  9x2  9 y2  x2  4x  4  y2  2 y 1
  8x2  4 x  8 y 2  2 y  5
         1           1      5
    x  x y  y 
      2          2

         2           4      8
           2             2
   x  1    y  1   45
                    
       4          8  64

          centre :  ,  
                     1 1
                        
                    4 8
                  3 5
         radius :     units
                   8
c) 3 z  z  2  i                         d) zz  2 z  z   0
  3z  z  2i                                x2  y2  4x  0
  9 x  9 y   x  2    y  1
     2      2          2         2            x  22  y 2  4
  9x2  9 y2  x2  4x  4  y2  2 y 1
  8x2  4 x  8 y 2  2 y  5
         1           1      5
    x  x y  y 
      2          2

         2           4      8
           2             2
   x  1    y  1   45
                    
       4          8  64

         centre :  ,  
                    1 1
                       
                   4 8
                  3 5
         radius :     units
                   8
c) 3 z  z  2  i                         d) zz  2 z  z   0
  3z  z  2i                                x2  y2  4x  0
  9 x  9 y   x  2    y  1
     2      2          2         2            x  22  y 2  4
  9x2  9 y2  x2  4x  4  y2  2 y 1        centre :  2 ,0 
  8x2  4 x  8 y 2  2 y  5
         1           1      5
    x  x y  y 
      2          2

         2           4      8
           2             2
   x  1    y  1   45
                    
       4          8  64

         centre :  ,  
                    1 1
                       
                   4 8
                  3 5
         radius :     units
                   8
c) 3 z  z  2  i                         d) zz  2 z  z   0
  3z  z  2i                                x2  y2  4x  0
  9 x  9 y   x  2    y  1
     2      2          2         2            x  22  y 2  4
  9x2  9 y2  x2  4x  4  y2  2 y 1        centre :  2 ,0 
  8x2  4 x  8 y 2  2 y  5                  radius : 2 units
         1           1      5
    x  x y  y 
      2          2

         2           4      8
           2             2
   x  1    y  1   45
                    
       4          8  64

         centre :  ,  
                    1 1
                       
                   4 8
                  3 5
         radius :     units
                   8
c) 3 z  z  2  i                                d) zz  2 z  z   0
  3z  z  2i                                       x2  y2  4x  0
  9 x  9 y   x  2    y  1
     2      2          2         2                   x  22  y 2  4
  9x2  9 y2  x2  4x  4  y2  2 y 1               centre :  2 ,0 
  8x2  4 x  8 y 2  2 y  5                         radius : 2 units
         1           1      5
    x  x y  y 
      2          2

         2           4      8
           2             2
   x  1    y  1   45
                    
       4          8  64

         centre :  ,  
                    1 1
                                         Exercise 4M; 1ac, 2bd, 3, 4,
                   4 8
                                                     5bd, 6
                  3 5
         radius :     units
                   8

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X2 T01 10 locus & complex numbers 1

  • 2. Locus and Complex Numbers Circles
  • 3. Locus and Complex Numbers Circles y R R R x R
  • 4. Locus and Complex Numbers Circles y R R R x R z R
  • 5. Locus and Complex Numbers Circles y R R R x R z R or zz  R 2
  • 6. Locus and Complex Numbers Circles y y R R  R R x x R z R or zz  R 2
  • 7. Locus and Complex Numbers Circles y y R R  R R x x R z R z   R or zz  R 2
  • 8. Locus and Complex Numbers Circles y y R R  R R x x R z R z   R or or zz  R 2  z    z     R 2
  • 9. e.g. (i) Express these circles in terms of z
  • 10. e.g. (i) Express these circles in terms of z a) x 2  y 2  16
  • 11. e.g. (i) Express these circles in terms of z a) x 2  y 2  16 z 4
  • 12. e.g. (i) Express these circles in terms of z a) x 2  y 2  16 z 4  zz  16
  • 13. e.g. (i) Express these circles in terms of z a) x 2  y 2  16 b) x 2  y 2  6 x  4 y  12  0 z 4  zz  16
  • 14. e.g. (i) Express these circles in terms of z a) x 2  y 2  16 b) x 2  y 2  6 x  4 y  12  0 z 4 x 2  6 x  y 2  4 y  12  zz  16
  • 15. e.g. (i) Express these circles in terms of z a) x 2  y 2  16 b) x 2  y 2  6 x  4 y  12  0 z 4 x 2  6 x  y 2  4 y  12  zz  16  x  32   y  22  25
  • 16. e.g. (i) Express these circles in terms of z a) x 2  y 2  16 b) x 2  y 2  6 x  4 y  12  0 z 4 x 2  6 x  y 2  4 y  12  zz  16  x  32   y  22  25 z  3  2i  5
  • 17. e.g. (i) Express these circles in terms of z a) x 2  y 2  16 b) x 2  y 2  6 x  4 y  12  0 z 4 x 2  6 x  y 2  4 y  12  zz  16  x  32   y  22  25 z  3  2i  5  z  3  2i  z  3  2i   25
  • 18. e.g. (i) Express these circles in terms of z a) x 2  y 2  16 b) x 2  y 2  6 x  4 y  12  0 z 4 x 2  6 x  y 2  4 y  12  zz  16  x  32   y  22  25 z  3  2i  5  z  3  2i  z  3  2i   25 (ii) Find the centre and radius of;
  • 19. e.g. (i) Express these circles in terms of z a) x 2  y 2  16 b) x 2  y 2  6 x  4 y  12  0 z 4 x 2  6 x  y 2  4 y  12  zz  16  x  32   y  22  25 z  3  2i  5  z  3  2i  z  3  2i   25 (ii) Find the centre and radius of; a) z  5  i  2
  • 20. e.g. (i) Express these circles in terms of z a) x 2  y 2  16 b) x 2  y 2  6 x  4 y  12  0 z 4 x 2  6 x  y 2  4 y  12  zz  16  x  32   y  22  25 z  3  2i  5  z  3  2i  z  3  2i   25 (ii) Find the centre and radius of; a) z  5  i  2 centre : 5,1
  • 21. e.g. (i) Express these circles in terms of z a) x 2  y 2  16 b) x 2  y 2  6 x  4 y  12  0 z 4 x 2  6 x  y 2  4 y  12  zz  16  x  32   y  22  25 z  3  2i  5  z  3  2i  z  3  2i   25 (ii) Find the centre and radius of; a) z  5  i  2 centre : 5,1 radius : 2 units
  • 22. e.g. (i) Express these circles in terms of z a) x 2  y 2  16 b) x 2  y 2  6 x  4 y  12  0 z 4 x 2  6 x  y 2  4 y  12  zz  16  x  32   y  22  25 z  3  2i  5  z  3  2i  z  3  2i   25 (ii) Find the centre and radius of; a) z  5  i  2 b)  z  4  i  z  4  i   49 centre : 5,1 radius : 2 units
  • 23. e.g. (i) Express these circles in terms of z a) x 2  y 2  16 b) x 2  y 2  6 x  4 y  12  0 z 4 x 2  6 x  y 2  4 y  12  zz  16  x  32   y  22  25 z  3  2i  5  z  3  2i  z  3  2i   25 (ii) Find the centre and radius of; a) z  5  i  2 b)  z  4  i  z  4  i   49 centre : 5,1 centre :  4 ,  1 radius : 2 units
  • 24. e.g. (i) Express these circles in terms of z a) x 2  y 2  16 b) x 2  y 2  6 x  4 y  12  0 z 4 x 2  6 x  y 2  4 y  12  zz  16  x  32   y  22  25 z  3  2i  5  z  3  2i  z  3  2i   25 (ii) Find the centre and radius of; a) z  5  i  2 b)  z  4  i  z  4  i   49 centre : 5,1 centre :  4 ,  1 radius : 2 units radius : 7 units
  • 25. c) 3 z  z  2  i
  • 26. c) 3 z  z  2  i 3z  z  2i
  • 27. c) 3 z  z  2  i 3z  z  2i 9 x 2  9 y 2   x  2    y  1 2 2
  • 28. c) 3 z  z  2  i 3z  z  2i 9 x 2  9 y 2   x  2    y  1 2 2 9x2  9 y2  x2  4x  4  y2  2 y 1
  • 29. c) 3 z  z  2  i 3z  z  2i 9 x 2  9 y 2   x  2    y  1 2 2 9x2  9 y2  x2  4x  4  y2  2 y 1 8x2  4x  8 y 2  2 y  5
  • 30. c) 3 z  z  2  i 3z  z  2i 9 x 2  9 y 2   x  2    y  1 2 2 9x2  9 y2  x2  4x  4  y2  2 y 1 8x2  4x  8 y 2  2 y  5 1 1 5 x  x y  y  2 2 2 4 8
  • 31. c) 3 z  z  2  i 3z  z  2i 9 x 2  9 y 2   x  2    y  1 2 2 9x2  9 y2  x2  4x  4  y2  2 y 1 8x2  4x  8 y 2  2 y  5 1 1 5 x  x y  y  2 2 2 4 8 2 2  x  1    y  1   45      4  8  64
  • 32. c) 3 z  z  2  i 3z  z  2i 9 x 2  9 y 2   x  2    y  1 2 2 9x2  9 y2  x2  4x  4  y2  2 y 1 8x2  4x  8 y 2  2 y  5 1 1 5 x  x y  y  2 2 2 4 8 2 2  x  1    y  1   45      4  8  64 centre :  ,   1 1    4 8
  • 33. c) 3 z  z  2  i 3z  z  2i 9 x 2  9 y 2   x  2    y  1 2 2 9x2  9 y2  x2  4x  4  y2  2 y 1 8x2  4x  8 y 2  2 y  5 1 1 5 x  x y  y  2 2 2 4 8 2 2  x  1    y  1   45      4  8  64 centre :  ,   1 1    4 8 3 5 radius : units 8
  • 34. c) 3 z  z  2  i d) zz  2 z  z   0 3z  z  2i 9 x 2  9 y 2   x  2    y  1 2 2 9x2  9 y2  x2  4x  4  y2  2 y 1 8x2  4 x  8 y 2  2 y  5 1 1 5 x  x y  y  2 2 2 4 8 2 2  x  1    y  1   45      4  8  64 centre :  ,   1 1    4 8 3 5 radius : units 8
  • 35. c) 3 z  z  2  i d) zz  2 z  z   0 3z  z  2i x2  y2  4x  0 9 x 2  9 y 2   x  2    y  1 2 2 9x2  9 y2  x2  4x  4  y2  2 y 1 8x2  4 x  8 y 2  2 y  5 1 1 5 x  x y  y  2 2 2 4 8 2 2  x  1    y  1   45      4  8  64 centre :  ,   1 1    4 8 3 5 radius : units 8
  • 36. c) 3 z  z  2  i d) zz  2 z  z   0 3z  z  2i x2  y2  4x  0 9 x  9 y   x  2    y  1 2 2 2 2  x  22  y 2  4 9x2  9 y2  x2  4x  4  y2  2 y 1 8x2  4 x  8 y 2  2 y  5 1 1 5 x  x y  y  2 2 2 4 8 2 2  x  1    y  1   45      4  8  64 centre :  ,   1 1    4 8 3 5 radius : units 8
  • 37. c) 3 z  z  2  i d) zz  2 z  z   0 3z  z  2i x2  y2  4x  0 9 x  9 y   x  2    y  1 2 2 2 2  x  22  y 2  4 9x2  9 y2  x2  4x  4  y2  2 y 1 centre :  2 ,0  8x2  4 x  8 y 2  2 y  5 1 1 5 x  x y  y  2 2 2 4 8 2 2  x  1    y  1   45      4  8  64 centre :  ,   1 1    4 8 3 5 radius : units 8
  • 38. c) 3 z  z  2  i d) zz  2 z  z   0 3z  z  2i x2  y2  4x  0 9 x  9 y   x  2    y  1 2 2 2 2  x  22  y 2  4 9x2  9 y2  x2  4x  4  y2  2 y 1 centre :  2 ,0  8x2  4 x  8 y 2  2 y  5 radius : 2 units 1 1 5 x  x y  y  2 2 2 4 8 2 2  x  1    y  1   45      4  8  64 centre :  ,   1 1    4 8 3 5 radius : units 8
  • 39. c) 3 z  z  2  i d) zz  2 z  z   0 3z  z  2i x2  y2  4x  0 9 x  9 y   x  2    y  1 2 2 2 2  x  22  y 2  4 9x2  9 y2  x2  4x  4  y2  2 y 1 centre :  2 ,0  8x2  4 x  8 y 2  2 y  5 radius : 2 units 1 1 5 x  x y  y  2 2 2 4 8 2 2  x  1    y  1   45      4  8  64 centre :  ,   1 1   Exercise 4M; 1ac, 2bd, 3, 4,  4 8 5bd, 6 3 5 radius : units 8