how do I solve this equation, y*y=40

Using the square formulas

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y*y = 40
y^2 = 40
y = sqrt(40) or y = -sqrt(40)
y = sqrt(4 * 10) or y = -sqrt(4 * 10)
y = sqrt(4)sqrt(10) or y = -sqrt(4)sqrt(10)
y = 2sqrt(10) or y = -2sqrt(10)
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