2x2 + 11x + 12 = 2x2 + 3x + 8x + 12 = x*(2x + 3) + 4*(2x + 3) = (2x + 3)*(x + 4)
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y^2 + 7y + 12 = (y+4)(y+3)
11x+9=7x+21 11x-7x=4 4x+9=21 21-9=12 4x=12 12 divided by 4= 3 x=3
4x + 8 + 7x + 12 = 11x + 20
(x - 6)(x - 2)
11x + 8 = 8x + 20 3x + 8 = 20 3x = 12 x = 4