The expression can be factored as
-12x + 32y -16z = 4(-3x + 8y - 4z) but a slightly improved presentation would be to extract -4 from the original expression. So,
-12x + 32y -16z = -4(3x - 8y + 4z)
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x2-12x+35 = (x-5)(x-7)
2(3x^2 + 6x + 2)
(x - 8)(x - 4)
2x(x^2+x-6)
9x2 + 12x + 4 = 9x2 + 6x + 6x + 4 = 3x(3x + 2) + 2(3x + 2) = (3x + 2)(3x + 2) = (3x + 2)2