First, factor out the coefficient of x (in this case, 4)
4x+20----> 4(x+20/4) --> 4(x+5)
then, go make yourself a sandwich.
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8x2 + 15 + 26x = 8x2 + 26x + 15 = 8x2 + 20x + 6x + 15 = 4x(2x + 5) + 3(2x + 5) = (2x + 5)(4x + 3)
x3 + 6x2 - 4x - 24 = (x + 6)(x2 - 4) = (x + 6)(x + 2)(x - 2)
8x+30=4x+18 -4x -4x 4x+30=18 -30 -30 4x=-12 4x/4=-12/4 x=-3
x2 + 4x + 3 = (x + 1)(x + 3)
3x-3x+4x^2+8x=4x^2+8x