text: how do you find the value of x when y=10? the equation is y=(8-x)(x+3)i need the whole process. y=(8-x)(x+3) 10= 8x + 24 - 3x - x^2 0 = 5x + 24 - x^2 -10 multiply by -1  x^2-5x-14=0  (x-7)(x+2) =0  x=7 or -2 x={7 , -2}