Evaluate
\frac{21\sqrt{2}}{2}\approx 14.849242405
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\frac{42\sqrt{2}}{2\left(\sqrt{2}\right)^{2}}
Rationalize the denominator of \frac{42}{2\sqrt{2}} by multiplying numerator and denominator by \sqrt{2}.
\frac{42\sqrt{2}}{2\times 2}
The square of \sqrt{2} is 2.
\frac{21\sqrt{2}}{2}
Cancel out 2 in both numerator and denominator.
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