Evaluate
-\sqrt{5}\approx -2.236067977
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\frac{\sqrt{7}-\sqrt{5}-\left(\sqrt{7}+\sqrt{5}\right)}{2}
Since \frac{\sqrt{7}-\sqrt{5}}{2} and \frac{\sqrt{7}+\sqrt{5}}{2} have the same denominator, subtract them by subtracting their numerators.
\frac{\sqrt{7}-\sqrt{5}-\sqrt{7}-\sqrt{5}}{2}
Do the multiplications in \sqrt{7}-\sqrt{5}-\left(\sqrt{7}+\sqrt{5}\right).
\frac{-2\sqrt{5}}{2}
Do the calculations in \sqrt{7}-\sqrt{5}-\sqrt{7}-\sqrt{5}.
-\sqrt{5}
Cancel out 2 and 2.
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