x2 - 8x = x*x - 8*x = x*(x - 8)
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5 - 8x + 3x2 = 3x2 - 8x + 5 (since the sign of the second term is negative, then 5 can be factored as (-1)(-5)) = (3x - )(x - ) (try to put 1 or 5 to the empty places, in order to obtain -8x) = (3x - 5)(x - 1)
(x + 1)(x - 8)
(x - 2)(2x + 3)
The factoring is as follows: x2 - y2 = (x + y) * (x - y)
x^2 - y^2 - 4 is in its simplest form.