52 does not have a square root (7.21... is as close as you get).
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7.211102550927978...
52
42 is 16, less than 20 52 is 25, more than 20. so, 20 is not a perfect square, and does not have an integral square root. But, the square root of any integer is either an integer itself, or irrational. So, square root 20 is irrational
2x2x5x7x7x5 = 22*52*72 So sqrt(2x2x5x7x7x5) = sqrt(22*52*72) = 2*5*7 = 70
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