Question

which of the following is an x-intercept of the function, f(x)=x^2-25?a. -25b. -20c. -15d. -5

Answer 1

We are given

$f(x)=x^2-25$

We want to find the x-intercept

Solution

To get the x-intercept, we need to put

$f(x)=0$

and we will solve for x

$\begin{gathered} f(x)=0 \\ x^2-25=0 \\ (x-5)(x+5)=0 \\ x=-5,5 \end{gathered}$

Thus, the intercept in the option given is -5

Option D