Question

Which of the following is an x-intercept of the function f(x)=x^2-25

Answer 1

The x-intercept of a function is when the y-value is 0.
Replace y with 0 in the equation. You get the following.

$x^2-25=0$

Add both sides by 25

$x^2=25$

Take the square root.

$x= \pm \sqrt{25}$
$= \pm 5$

This means that the x-intercepts are 5 and -5.

A is your answer.

Answer 2

 The answer is A. -5 all others are too big