Evaluate
-3\sqrt{10}\approx -9.486832981
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-\sqrt{90}
Multiply 6 and 15 to get 90.
-3\sqrt{10}
Factor 90=3^{2}\times 10. Rewrite the square root of the product \sqrt{3^{2}\times 10} as the product of square roots \sqrt{3^{2}}\sqrt{10}. Take the square root of 3^{2}.
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