x2 - 9x - 6 = 0
x2 - 9x + (9/2)2 = 6 + (9/2)2
(x - 9/2)2 = 6 + 81/4
x - 9/2 = ± √105 / 2
x = (9 ± √105) / 2
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x2+9x+18 find factors of 18 that add up to 9, in this case 6&3 (x+6)(x+3)
x2 + 3x - 18 = 0 (x - 3)(x + 6) = 0 x = 3 or -6
x2+7x=-2x2+6 3x2+7x-6=0 (3x-2)(x+3)=0 3x-2=0 or x+3=0 x=2/3 or x=-3
x^2+3x-18=0 (x+6)(x-3)=0
x5 - 2x4 - 24x3 = 0 x3(x2 - 2x - 24) = 0 x3(x2 + 4x - 6x - 24) = 0 x3(x - 6)(x + 4) = 0 x = {-4, 0, 6}