Which of the following is an x-intercept of the function f(x)=x^2-64

Question

asked Apr 6, 2019 173k views

2 Answers

Tim Elhajj · Answer 1 · 2019-04-11T08:03:45+0000

Answer:

x- intercepts are - 8 and 8

Explanation:

to find the x-intercepts set f(x) = 0, that is

x² - 64 = 0 ( this is a difference of squares )

(x - 8)(x + 8) = 0 ← in factored form

equate each factor to zero and solve for x

x - 8 = 0 ⇒ x = 8

x + 8 = 0 ⇒ x = - 8