Evaluate
\frac{15\sqrt{7}}{14s}
Differentiate w.r.t. s
-\frac{15\sqrt{7}}{14s^{2}}
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\frac{15\sqrt{7}}{2\left(\sqrt{7}\right)^{2}s}
Rationalize the denominator of \frac{15}{2\sqrt{7}s} by multiplying numerator and denominator by \sqrt{7}.
\frac{15\sqrt{7}}{2\times 7s}
The square of \sqrt{7} is 7.
\frac{15\sqrt{7}}{14s}
Multiply 2 and 7 to get 14.
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