how to solve a polynomial inequality algebraically
Section 2.6 Solving Inequalities Algebraically and Graphically 223 Polynomial Inequalities To solve a polynomial inequality such as use the fact that apolynomial can change signs only at its zeros (the x-values that make thepolynomial equal to zero).. Find all real zeros of the polynomial, and arrange the zeros inincreasing order. The zeros of a polynomial are its critical numbers. 2. Use the critical numbers to determine the test intervals. 3. Choose one representative value in each test interval and evaluatethe polynomial at that value.