Evaluate
2\sqrt{2}-3\approx -0.171572875
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2\sqrt{2}-\sqrt{9}
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}.
2\sqrt{2}-3
Calculate the square root of 9 and get 3.
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