Evaluate
-\frac{2\sqrt{5}}{5}\approx -0.894427191
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-\frac{\sqrt{5}}{\left(\sqrt{5}\right)^{2}}-\frac{1}{\sqrt{5}}
Rationalize the denominator of \frac{1}{\sqrt{5}} by multiplying numerator and denominator by \sqrt{5}.
-\frac{\sqrt{5}}{5}-\frac{1}{\sqrt{5}}
The square of \sqrt{5} is 5.
-\frac{\sqrt{5}}{5}-\frac{\sqrt{5}}{\left(\sqrt{5}\right)^{2}}
Rationalize the denominator of \frac{1}{\sqrt{5}} by multiplying numerator and denominator by \sqrt{5}.
-\frac{\sqrt{5}}{5}-\frac{\sqrt{5}}{5}
The square of \sqrt{5} is 5.
-\frac{2}{5}\sqrt{5}
Combine -\frac{\sqrt{5}}{5} and -\frac{\sqrt{5}}{5} to get -\frac{2}{5}\sqrt{5}.
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