# Chapter 5 - Section 5.2 - Simplifying Algebraic Expressions - Exercise - Page 218: 61

$$-36 x^2+48y^2.$$

#### Work Step by Step

We simplify by removing the parentheses and then combining the like terms as follows: $$-12(3x^2 - 4y^2)=-36 x^2+48y^2.$$

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