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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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Q: How do you divide 28 by the square root of 8?
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