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Inequality




             1
Rational Inequality

                      x ­ 1 
 Example                            < 0
                 (x ­ 2)(x + 3)

1. Simplify the rational expression so that zero is on one side 
and the expression involving x is on the other side

2. Factor any quadratic expressions

3. Place critical numbers on a number line
   Critical Numbers: the zeros, and the values that make    
              the inequality undefined(non­permissible values)


4. Test points within each interval between the critical values, to 
determine if the expression as a whole is positive or negative

5. State the intervals that qualify as solutions to the 
inequality




                                                                       2
Solve the inequality

      x ­ 1 
                                 < 0
 (x ­ 2)(x + 3)




   ­10   ­9   ­8   ­7   ­6   ­5 ­4   ­3   ­2   ­1   0   1   2   3   4   5   6   7   8   9   10




                                                                                                 3
x ­ 1 
The graph of       y =   (x ­ 2)(x + 3)




                                          < 0




                                                4
Solve: 
   x2 ­ 2x ­ 8
                                   > 0
                                   _
        x ­ 1




 ­10   ­9   ­8   ­7   ­6   ­5 ­4   ­3   ­2   ­1   0   1   2   3   4   5   6   7   8   9   10




                                                                                               5
Graph of                  y  =   x2 ­ 2x ­ 8
                                   x ­ 1




                                               6
Solve

     x                               1
                        >
   x ­ 3                         x + 2




   ­10   ­9   ­8   ­7   ­6   ­5 ­4   ­3   ­2   ­1   0   1   2   3   4   5   6   7   8   9   10




                                                                                                 7
8
Exercise 28

questions  6  ­  12




                      9

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Nov. 17 Rational Inequalities

  • 2. Rational Inequality x ­ 1  Example < 0 (x ­ 2)(x + 3) 1. Simplify the rational expression so that zero is on one side  and the expression involving x is on the other side 2. Factor any quadratic expressions 3. Place critical numbers on a number line Critical Numbers: the zeros, and the values that make                the inequality undefined(non­permissible values) 4. Test points within each interval between the critical values, to  determine if the expression as a whole is positive or negative 5. State the intervals that qualify as solutions to the  inequality 2
  • 3. Solve the inequality x ­ 1  < 0 (x ­ 2)(x + 3) ­10 ­9 ­8 ­7 ­6 ­5 ­4 ­3 ­2 ­1 0 1 2 3 4 5 6 7 8 9 10 3
  • 5. Solve:  x2 ­ 2x ­ 8 > 0 _ x ­ 1 ­10 ­9 ­8 ­7 ­6 ­5 ­4 ­3 ­2 ­1 0 1 2 3 4 5 6 7 8 9 10 5
  • 7. Solve x 1 > x ­ 3 x + 2 ­10 ­9 ­8 ­7 ­6 ­5 ­4 ­3 ­2 ­1 0 1 2 3 4 5 6 7 8 9 10 7
  • 8. 8