Evaluate
\sqrt{2}-2\approx -0.585786438
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\frac{2\sqrt{2}-4}{2}
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}.
\sqrt{2}-2
Divide each term of 2\sqrt{2}-4 by 2 to get \sqrt{2}-2.
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