That can be factored to -((x + 5)(x - 3))
8x2-39x+45 = (8x-15)(x-3) when factored
x2-4x-165 = (x-15)(x+11) when factored
3x2-39x-90 = (3x+6)(x-15) when factored
2x2 + 7x - 15 = (2x - 3)(x + 5)
X2 - 8X + 15 = (X - 3)(X - 5)
x - 3
x - 5
x^2-15=2xx^2-2x-15=0Once you get to this point, check to see if it can be factored. In this case, it can be factored into (x-5)(x+3)=0.Therefore, x= 5 and -3
It is impossible but if it were x squared plus 2x minus 15 the equation would be (x+5) (x-3) with x being equal to either -5 or 3. If the original problem was x squared minus 2x minus 15 the equation would be (x-5)(x+3) and x would be equal to either 5 or -3
(x - 5)(x - 3)
Divide all terms by 3 gives: x2-5-14 and when factored gives: (x+2)(x-7)