12x+x = 13x
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-2x3 + 2x2 + 12x =(-2x) (x2 - x - 6) =(-2x) (x+2) (x-3)
x2-12x+36 = (x-6)2
Factor. X^2 + 12X X(X + 12) = 0 X = 0 ------------- X + 12 = 0 X = - 12 --------------
Think of this a 12 x-rays + 5 x-rays Makes 17 x-rays. 12x+5x=17x
5x-8 + 7x 12x-8 12x = 8 x = 8/12 x= 2/3