Evaluate
-\frac{\sqrt{15}}{3}\approx -1.290994449
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\frac{5\sqrt{15}}{-\left(\sqrt{15}\right)^{2}}
Rationalize the denominator of \frac{5}{-\sqrt{15}} by multiplying numerator and denominator by \sqrt{15}.
\frac{5\sqrt{15}}{-15}
The square of \sqrt{15} is 15.
\frac{\sqrt{15}}{-3}
Cancel out 5 in both numerator and denominator.
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