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the square root of 20 in it's simplest form is ^2 square root of 5
5 times the square root of 21
square root of 20 = square root of 4 * square root of 5. square root of 4 = 2, so your answer is 2 square root of 5.
5
The square root of 75 is an irrational number and it is 5 times the square root of 3