Question

Practice determining key aspects of quadratic functions given in factored form. Which point is an x-intercept of the quadratic function f(x) = (x – 4)(x + 2)? (–4, 0) (–2, 0) (0, 2) (4, –2)

Answer 1

An x intercept occurs whenever y=0.

y=(x-4)(x+2)

So for y=0, x=-2 or 4, so the x-intercepts are:

(-2, 0) and (4, 0)

Only (-2, 0) is within your answer choices.

Answer 2

(-2,0) hope this helps