Evaluate
-12\sqrt{13}\approx -43.266615306
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-4\times 3\sqrt{13}
Factor 117=3^{2}\times 13. Rewrite the square root of the product \sqrt{3^{2}\times 13} as the product of square roots \sqrt{3^{2}}\sqrt{13}. Take the square root of 3^{2}.
-12\sqrt{13}
Multiply -4 and 3 to get -12.
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