Respuesta :

To find a perfect square we want the equation to look like (y - 8)(y-8) because 
the two numbers that add up to -16 and multiply into 64. are -8, -8. -8^2 is 64.
64 is the answer because it is in the form of x^2 -2xy+y^2. so y^2- 2.y.8+ 8^2
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