Question

What is the midpoint of the x-intercepts of f(x)=(x-4)(x+4)

Answer 1

(4 + (-4))/2 = 0/2 = 0

The midpoint is x=0, which is the equation of the axis of symmetry for this parabola.

Answer 2

SInce both lines run through (4,-4) they meet up at 0 on the Y axis which means the answer to the question is (0,0)