Question

Which point is an x-intercept of the quadratic function

Answer 1

Answer:

(–9,0)

Step-by-step explanation:

f(x) = (x – 8)(x + 9)

     = x² + 9x -8x - 72

     = x² + x - 72

x-intercept is a coordinate of x axis where a function cuts the x-axis. They are points where y=0 or f(x) = 0.

x² + x - 72 =  (x – 8)(x + 9) = 0

∴  x – 8 = 0

    x = 8

    x + 9 = 0

     x = -9

The required points are (8, 0) and (-9, 0).

From the choices given there is only one correct answer. (–9,0)