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Anonymous
4x2 - 20x + 16 = 4(x2 - 5x + 4)
= 4(x - 1)(x - 4)
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4x + 16 + 1 = 4x + 17 which cannot be factorised.
x^2 + 10x + 16 = (x + 8)(x + 2)
(3x + 4)(3x + 4)
4(y + 2)(y + 2)
4(x + 2)(x + 2)