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### คำตอบพหุนาม

1. 1. แบบฝึกหัดการหาคาตอบสมการพหุนามจงหาคาตอบของสมการต่อไปนี้1. x 2  3 x  4  0 2. x 2  2  3 x……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..3. 2 ( x  5 )  10 4. x 2  1  0……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..5. x 2  5 x  0 6. x 2  4  0……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..7. x 2  x  2  0 8. x 2  3 x  2  0……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..9. 6 x 2  11 x  4  0 10. x 2  4 x  0……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..11. x 2  10 x  25  0 12.  x 2  3 x  4  0……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..13. x 2   8 x  12 14. x 2  64  0……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..15. x 2  2 x  1  0 16. x 2  6 x  5  0……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..17. p 2  5 p  14  0 18. x 2  7 x  12  0……………………………………..………………. …....…….………………………………………..
2. 2. ……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..19. y 2  4 y  3  0 20. x 2  8 x  7  0……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..21. x 2   8 x  16 22. m 2  35  12 m……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..23. y 2  3 y  18 24. 11  10 x  x 2  0……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..25. a 2  7 a  12 =0 26. x 2  x  30……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..27. y 2  3 y  18 28. 7 n  18  n 2……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..29. x 2  20 x   100 30. 10 b  b 2  25……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..31. m ( m  9 )  36 32. 60  17 r  r 2……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….……………………………………….. 2 x 133.  x4 34. 3 m 2   2m 9 4……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….……………………………………….. 535. 2 x 2  x  7 0 36. x 2  3 x  4 x 2  36 3……………………………………..………………. …....…….………………………………………..
3. 3. ……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..37. ( x  1) 2  (1  x ) 2 38. ( 2 x  3 ) 2  ( x  2 ) 2  0……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..39. a  12 a   32 40.  x 2  15 x  36……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..41. 2 x 2  7 x  6  0 42. 4 x 2  10  3 x……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….……………………………………….. 143. y 2  y2 44.  6 x 2  12 x  6  0 6……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..45. 4 . 5 y 2  6 y  6  0 46. 5 x 2  45  0……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..47. 4 x 2  9  0 48.  48  3 x 2  0……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..49.  2 x  5   0 2 50. 18 m  8   35 m 2……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..
4. 4. ……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..51. 4 x  1 .6 x 2  2 .5 52. ( x  2 ) 2  4  0……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..53. x 2  1  x 2  1 54. x 2  ( 2 x  1) 2  0……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..55. 5 n ( 4 n  3 )  0 56. m ( 3 m  4 )  0……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..57. 2 x 2  5 x  3  0 58. 3 x 2  10 x  3  0……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..59. 3 y 2  5 y  2  0 60. 6 x 2  5 x  4  0……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..61. 2 y 2  9 y  18  0 62. 5 n 2  7 n  0……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..63. 4 a 2  10  3 a 64. 3 a 2  2 a  5……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..
5. 5. ……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..65. 3 x 2  8  2 x 66. x ( x  2 )  3……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..67. ( y  12 ) y   32 68. 1 .2 x 2  1 .7 x   0 .6……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….……………………………………….. 1  7 x  12 70. ( 4 a  3 ) 2  4 a 269. x 2……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..……………………………………..………………. …....…….………………………………………..