# Chapter R - Elementary Algebra Review - R.6 Rational Expressions and Equations - R.6 Exercise Set - Page 980: 3

The expression is undefined if $p=2$ or $p=-2$.

#### Work Step by Step

A fraction is undefined, if the denominator equals to zero. Here: $p^2-4=0$ $p^2=4$ The two solutions are: $p=2$ or $p=-2$ The expression is undefined if $p=2$ or $p=-2$.

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