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3:01 You say it's in the form of a "perfect square" here, but that's the wrong term. It's a "difference of two squares". A perfect square is an integer that has an integer square root. (√75+√25)/(√75-√25) √25(√3+1)/√25(√3-1) (√3+1)(√3+1)/(√3-1)(√3+1) (3+1+2√3)/(3-1) (4+2√3)/2 = 2 + √3