x2+10x-24 = (x-2)(x+12) when factored
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x2+10x-24 = (x-2)(x+12)
For a start you tell us what the expression equals....
x2 + 10x + 21 = (x + 3)(x + 7)
(x2+10x+21)/(x+3) = (x+7)
x2+10x+1 = -12+2x x2+10x-2x+1+12 = 0 x2+8x+13 = 0 Solving by using the quadratic equation formula: x = - 4 - or + the square root of 3