Question
Simplify each rational expression. See Examples 2 through $5 .$$$\frac{x^{2}-49}{7-x}$$
Step 1
The expression $x^{2}-49$ is a difference of two squares, which can be factored into $(x-7)(x+7)$. So, the expression becomes: $$ \frac{(x-7)(x+7)}{7-x} $$ Show more…
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