Chapter 11 - Rational Expressions and Functions - 11-2 Multiplying and Dividing Rational Expressions - Practice and Problem-Solving Exercises - Page 675: 63

When $x = 0$ and $x=-4$ the expression is undefined.

$\frac{2x^2-5x-12}{6x} \div \frac{-3x-12}{x^2-16} $ Solve for what x cannot be: $6x = 0 \rightarrow x = 0$ $-3x-12 = 0 \rightarrow x =-4$ When $x = 0$ and $x=-4$ the expression is undefined.