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\frac{x\sqrt{2}}{\left(\sqrt{2}\right)^{2}}\times \frac{\sqrt{8}}{x}
Rationalize the denominator of \frac{x}{\sqrt{2}} by multiplying numerator and denominator by \sqrt{2}.
\frac{x\sqrt{2}}{2}\times \frac{\sqrt{8}}{x}
The square of \sqrt{2} is 2.
\frac{x\sqrt{2}}{2}\times \frac{2\sqrt{2}}{x}
Factor 8=2^{2}\times 2. Rewrite the square root of the product \sqrt{2^{2}\times 2} as the product of square roots \sqrt{2^{2}}\sqrt{2}. Take the square root of 2^{2}.
\frac{x\sqrt{2}\times 2\sqrt{2}}{2x}
Multiply \frac{x\sqrt{2}}{2} times \frac{2\sqrt{2}}{x} by multiplying numerator times numerator and denominator times denominator.
\sqrt{2}\sqrt{2}
Cancel out 2x in both numerator and denominator.
2
Multiply \sqrt{2} and \sqrt{2} to get 2.