Evaluate
-33\sqrt{7}\approx -87.309793265
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-5\sqrt{7}-7\times 4\sqrt{7}
Factor 112=4^{2}\times 7. Rewrite the square root of the product \sqrt{4^{2}\times 7} as the product of square roots \sqrt{4^{2}}\sqrt{7}. Take the square root of 4^{2}.
-5\sqrt{7}-28\sqrt{7}
Multiply -7 and 4 to get -28.
-33\sqrt{7}
Combine -5\sqrt{7} and -28\sqrt{7} to get -33\sqrt{7}.
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