(ax - 4)(bx - 2y)
(ax + b)(x - 8y)
(ax - 2y)(bx - 4)
(bx - 4)(ax - 2y)
(abx - 4)(x - 2y)
Correct answer is A
abx2 + 8y - 4bx - 2axy = (abx2 - 4bx) + (8y - 2axy)
= bx(ax - 4) 2y(ax - 4) 2y(ax - 4)
= (bx - 2y)(ax - 4)
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