3/sqrt(X + 4) * sqrt(X + 4)/sqrt(X + 4)
3sqrt(X + 4)/(X + 4)
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The idea is to get rid of the square root in the denominator. For this purpose, you must multiply numerator and denominator by the square root of 6 in this case.
You cannot. The square root of 5 is irrational.
4=(sqrt2)4
(2√24) / √54 = (2√4√6) / (√9√6) = (4√6)/(3√6) = 4/3
square root of 27 plus the square root of 75