
Francisco P. answered 10/08/14
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Rigorous Physics Tutoring
The difference of two squares could be factored as a2 - b2 = (a - b)(a + b).
(4x - 3)2 - y2 = [(4x-3) - y][(4x-3) + y] = (4x - 3 - y)(4x -3 + y)