2.7 NONLINEAR INEQUALITIES Objectives Solve polynomial inequalities. Solve rational inequalities. Use inequalities to model and solve real-life problems. *We have discussed polynomial and rational functions and equations. Now, we will discuss inequalities that contain polynomial and rational functions. Polynomial Inequalities *This entire section hinges upon the fact that a real number can only be one of three things: positive, ___________________ , or ___________________ . This is called the Law of Trichotomy.
*If an expression contains division (such as
1 ), then (depending on x ) that expression could be: x
positive, ___________________ , ______________________ , or __________________________ .
*What are key numbers (critical values) of a polynomial inequality? How do they help determine the solution set of a polynomial inequality?
TURN OVER
Ex) Solve the following polynomial inequality and show on the x − axis which x − values are in the solution set.
x2 − x − 6 < 0
*How does the graph of y = x 2 − x − 6 relate to the above example? Sketch the graph using a graphing utility to help.
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Ex) Solve the following polynomial inequality and show on the x − axis which x − values are in the solution set.
2 x 3 − 3 x 2 − 32 x > −48
TURN OVER
Rational Inequalities *Solving rational inequalities is not that different than solving polynomial inequalities. The only difference is that one more type of key number (critical value) must be considered. *In general, how are the key numbers of a rational inequality determined?
Ex) Solve the following rational inequality and show on the x − axis which x − values are in the solution set.
2x − 7 ≤3 x −5
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Applications Ex) The marketing department of a calculator manufacturer has determined that the demand for a new model of calculator is
p= 100 − 0.00001x, 0 ≤ x ≤ 10, 000, 000 where p is the price per calculator (in dollars) and x represents the number of calculators sold. The total cost of producing x calculators is
= C 10 x + 2,500, 00. What prices can the company charge per calculator to obtain a profit of at least $190, 000, 000?
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