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Anonymous
4y2 + 16y + 16 = 4(y2 + 4y + 4) = 4(y2 + 2y + 2y + 2) = 4[y(y + 2) + 2(y + 2)]
= 4(y + 2)2
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4(y + 2)(y + 2)
11y + 16 + 5y = 16y + 16 = 16(y + 1)
(b + 4)(b + 4)
2(x + 4)(x + 2)
x^2 + 10x + 16 = (x + 8)(x + 2)