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-6\times \frac{\sqrt{1}}{\sqrt{2}}
Rewrite the square root of the division \sqrt{\frac{1}{2}} as the division of square roots \frac{\sqrt{1}}{\sqrt{2}}.
-6\times \frac{1}{\sqrt{2}}
Calculate the square root of 1 and get 1.
-6\times \frac{\sqrt{2}}{\left(\sqrt{2}\right)^{2}}
Rationalize the denominator of \frac{1}{\sqrt{2}} by multiplying numerator and denominator by \sqrt{2}.
-6\times \frac{\sqrt{2}}{2}
The square of \sqrt{2} is 2.
-3\sqrt{2}
Cancel out 2, the greatest common factor in 6 and 2.