factorise (2x+p-q)square -(2x-p+q)square
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(2x+p-q)²-(2x-p+q)²
as, a²-b²=(a+b)(a-b)
(2x+p-q)²-(2x-p+q)²=(2x+p-q+2x-p+q)(2x+p-q-2x-p+q)
=4x (answer)
Hope it helps!
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