CPM Homework Help : PC3 Problem 1-55

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1-55.

Are the following pairs of expressions equivalent? Explain how you know using at least two different methods.

$\frac { x ^ { 2 } - 1 } { x ^ { 2 } + 1 }$ and $-1$

$\frac { 3 x + 2 } { x - 1 }$ and $3+\frac{5}{x-1}$

Hint:

Try substituting values such as $x=2$ , $3$ , 4 etc.

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