Evaluate
42\sqrt{15}\approx 162.665300541
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6\sqrt{35}\sqrt{21}
Multiply 2 and 3 to get 6.
6\sqrt{735}
To multiply \sqrt{35} and \sqrt{21}, multiply the numbers under the square root.
6\times 7\sqrt{15}
Factor 735=7^{2}\times 15. Rewrite the square root of the product \sqrt{7^{2}\times 15} as the product of square roots \sqrt{7^{2}}\sqrt{15}. Take the square root of 7^{2}.
42\sqrt{15}
Multiply 6 and 7 to get 42.
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