what is the square root of 64-16y+y²
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√(y^2-8y-8y+64)
√y(y-8)-8(y-8)
√(y-8)(y-8)
√(y-8)^2
y-8
√y(y-8)-8(y-8)
√(y-8)(y-8)
√(y-8)^2
y-8
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