Evaluate
-\frac{\sqrt{7}}{14}\approx -0.188982237
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-\frac{\sqrt{7}}{2\left(\sqrt{7}\right)^{2}}
Rationalize the denominator of \frac{1}{2\sqrt{7}} by multiplying numerator and denominator by \sqrt{7}.
-\frac{\sqrt{7}}{2\times 7}
The square of \sqrt{7} is 7.
-\frac{\sqrt{7}}{14}
Multiply 2 and 7 to get 14.
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