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Anonymous
x - 4x + 4 = -3x + 4 which cannot be factorised.
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But x^2 - 4x + 4 factors to (x - 2)(x - 2)
4(x-1)(x+1)
(x + 4)(x + 8)
15(p + 4)
3(4 + q)
6x(3x2 - x + 4)
(d + 4)(d + 8)