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\frac{\sqrt{9-1}}{3-1}
Calculate 3 to the power of 2 and get 9.
\frac{\sqrt{8}}{3-1}
Subtract 1 from 9 to get 8.
\frac{2\sqrt{2}}{3-1}
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{2\sqrt{2}}{2}
Subtract 1 from 3 to get 2.
\sqrt{2}
Cancel out 2 and 2.