Evaluate
-2\sqrt{2}\approx -2.828427125
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-3\sqrt{2}+\sqrt{2}
Factor 18=3^{2}\times 2. Rewrite the square root of the product \sqrt{3^{2}\times 2} as the product of square roots \sqrt{3^{2}}\sqrt{2}. Take the square root of 3^{2}.
-2\sqrt{2}
Combine -3\sqrt{2} and \sqrt{2} to get -2\sqrt{2}.
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