Evaluate
84
Factor
2^{2}\times 3\times 7
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\sqrt{21\times 8\left(21-14\right)\left(21-15\right)}
Subtract 13 from 21 to get 8.
\sqrt{168\left(21-14\right)\left(21-15\right)}
Multiply 21 and 8 to get 168.
\sqrt{168\times 7\left(21-15\right)}
Subtract 14 from 21 to get 7.
\sqrt{1176\left(21-15\right)}
Multiply 168 and 7 to get 1176.
\sqrt{1176\times 6}
Subtract 15 from 21 to get 6.
\sqrt{7056}
Multiply 1176 and 6 to get 7056.
84
Calculate the square root of 7056 and get 84.
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