Question

Diego wrote f(x)=(x+2)(x−4) as an example of a function whose graph has x-intercepts at x=−4, 2. What was his mistake?

Answer 1

The x-intercepts would be
x= -2 and x=4
His mistake was that he didn’t solve for x. To solve for x:
x+2=0
x=-2
and
x-4=0
x=4