first find the factors of 84 if there is a perfect square (4,9,16,25, etc.) multiplied by another number to get 84, then use that
so 84 has 4 and 21, so take the square root of 4 which is and put it outside of the root sign and put 21 in it
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Expressed as a surd, the square root of 84 is equal to 2 sqrt (21). √84 = √(4 x 21) = √4√21 = 2√21
The square root of 84 is irrational and is approx 9.1652.
Press 2ND and then the square root sign (above x2). Then type the number you want to find the square root of. Press ENTER to see the answer.
√6 x √14 is the same as √(6x14). This equals √84, which can be simplified to 2√21.
the square root of 36 times the sine, in radians, of pi/2