What is the square root of 64y16? 4y4 4y8 8y4 8y8

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What is the square root of 64y16? 4y4 4y8 8y4 8y8

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A square root (x) can be represented by (x) ^ 1/2
so √64y16 = (√64) * (y16) ^ 1/2
= 8 * y ^ 16/2
= 8y8