### Home > AC > Chapter 11 > Lesson 11.1.5 > Problem 11-56

11-56.

Simplify the rational expression below. What values can *x* not be? Homework Help ✎

The denominator cannot be equal to zero.What value(s) of *x* would make the denominator zero?

(2*x* + 1)(*x* + 5) = 0

2*x*^{2} + 11*x* + 5 = 0

*x* ≠ −0.5 or −5

Factor both the numerator and the denominator.

Look for 1.