Evaluate
18\sqrt{2}\approx 25.455844123
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3\left(\sqrt{7}\sqrt{2}\sqrt{7}-\sqrt{2}\right)
Factor 14=7\times 2. Rewrite the square root of the product \sqrt{7\times 2} as the product of square roots \sqrt{7}\sqrt{2}.
3\left(7\sqrt{2}-\sqrt{2}\right)
Multiply \sqrt{7} and \sqrt{7} to get 7.
3\times 6\sqrt{2}
Combine 7\sqrt{2} and -\sqrt{2} to get 6\sqrt{2}.
18\sqrt{2}
Multiply 3 and 6 to get 18.
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