Question

What is the value of x when f (x) = 4

Answer 1

B

Explanation:

Set up the equation first:

4=x^2+4 (this is because we were told f(x)=4)

Bring the 4 from the x^2 side to the side with a number:

4-4=x^2

Simplify

x^2=0

`√(0) = 0`