Evaluate
\frac{2\left(x^{2}-1\right)}{x-4}
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\frac{2\left(x^{2}-1\right)}{x-4}
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\frac{x^{2}+7x+6+x^{2}-7x-8}{x-4}
Since \frac{x^{2}+7x+6}{x-4} and \frac{x^{2}-7x-8}{x-4} have the same denominator, add them by adding their numerators.
\frac{2x^{2}-2}{x-4}
Combine like terms in x^{2}+7x+6+x^{2}-7x-8.
\frac{x^{2}+7x+6+x^{2}-7x-8}{x-4}
Since \frac{x^{2}+7x+6}{x-4} and \frac{x^{2}-7x-8}{x-4} have the same denominator, add them by adding their numerators.
\frac{2x^{2}-2}{x-4}
Combine like terms in x^{2}+7x+6+x^{2}-7x-8.
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