If you would like to find the x-intercept of the quadratic function f(x) = (x - 8) (x + 9), you can do this using the following steps:
f(x) = (x - 8) (x + 9)
(-9, 0): f(-9) = (-9 - 8) (-9 + 9) = (-17) 0 = 0
x = -9 and y = 0
The correct result would be (-9, 0).
