# Chapter 7 - Section 7.1 - Simplifying Rational Expressions - Exercise Set: 20

Expression is undefined when x=7 or x=-2

#### Work Step by Step

Expression is undefined when $x^{2}$-5x-14=0 $x^{2}$+2x-7x-14=0 x(x+2)-7(x+2)=0 (x-7)(x+2)=0 x-7=0 or x+2=0 x=7 or x=-2

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