Evaluate
-\frac{x^{2}-x-4}{3+x-x^{2}}
Expand
\frac{x^{2}-x-4}{x^{2}-x-3}
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\frac{\left(x-\left(-\frac{1}{2}\sqrt{13}+\frac{1}{2}\right)\right)\left(x-\left(-\frac{1}{2}\sqrt{17}+\frac{1}{2}\right)\right)\left(x-\left(\frac{1}{2}\sqrt{13}+\frac{1}{2}\right)\right)\left(x-\left(\frac{1}{2}\sqrt{17}+\frac{1}{2}\right)\right)}{\left(x-\left(-\frac{1}{2}\sqrt{13}+\frac{1}{2}\right)\right)^{2}\left(x-\left(\frac{1}{2}\sqrt{13}+\frac{1}{2}\right)\right)^{2}}
Factor the expressions that are not already factored.
\frac{\left(x-\left(-\frac{1}{2}\sqrt{17}+\frac{1}{2}\right)\right)\left(x-\left(\frac{1}{2}\sqrt{17}+\frac{1}{2}\right)\right)}{\left(x-\left(-\frac{1}{2}\sqrt{13}+\frac{1}{2}\right)\right)\left(x-\left(\frac{1}{2}\sqrt{13}+\frac{1}{2}\right)\right)}
Cancel out \left(x-\left(-\frac{1}{2}\sqrt{13}+\frac{1}{2}\right)\right)\left(x-\left(\frac{1}{2}\sqrt{13}+\frac{1}{2}\right)\right) in both numerator and denominator.
\frac{x^{2}-x-4}{x^{2}-x-3}
Expand the expression.
\frac{\left(x-\left(-\frac{1}{2}\sqrt{13}+\frac{1}{2}\right)\right)\left(x-\left(-\frac{1}{2}\sqrt{17}+\frac{1}{2}\right)\right)\left(x-\left(\frac{1}{2}\sqrt{13}+\frac{1}{2}\right)\right)\left(x-\left(\frac{1}{2}\sqrt{17}+\frac{1}{2}\right)\right)}{\left(x-\left(-\frac{1}{2}\sqrt{13}+\frac{1}{2}\right)\right)^{2}\left(x-\left(\frac{1}{2}\sqrt{13}+\frac{1}{2}\right)\right)^{2}}
Factor the expressions that are not already factored.
\frac{\left(x-\left(-\frac{1}{2}\sqrt{17}+\frac{1}{2}\right)\right)\left(x-\left(\frac{1}{2}\sqrt{17}+\frac{1}{2}\right)\right)}{\left(x-\left(-\frac{1}{2}\sqrt{13}+\frac{1}{2}\right)\right)\left(x-\left(\frac{1}{2}\sqrt{13}+\frac{1}{2}\right)\right)}
Cancel out \left(x-\left(-\frac{1}{2}\sqrt{13}+\frac{1}{2}\right)\right)\left(x-\left(\frac{1}{2}\sqrt{13}+\frac{1}{2}\right)\right) in both numerator and denominator.
\frac{x^{2}-x-4}{x^{2}-x-3}
Expand the expression.
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