28/sqrt(8) multiply top and bottom by sqrt(8)
= 28*sqrt(8)/[sqrt(8)*sqrt(8)]
= 28*sqrt(8)/8
= 7*sqrt(8)/2
But sqrt(8) = sqrt(4*2)= sqrt(4)*sqrt(2) = ±2*sqrt(2)
then 7*sqrt(8)/2 = ±7*2*sqrt(2)/2 = ±7*sqrt(2)
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Two to the power 8 (28) is 256 The square root of 256 is 16. When you take the square root of a number raised to a power y, divide that power by 2 (y/2) and that gives the square root. So the square root of 28 = 28/2 = 24 = 16
0.5
8
The principle square root of 64 is ±8.8.* * * * *The square roots of 64 are +8 and -8.The PRINCIPAL square root is the positive root, +8.So, the answer to the question that was asked is +8 not ±8.
7.937253933slightly less than 8 (square root of 64 is 8)