Question

If f(x)=x^2-4, then f(x+3)=?

Answer 1

x = 2

Explanation:

When solving an equation like this, you can act as if f(x) is equal to 0. So in this case:
`x^(2) - 4 = 0`. Add 4 to both sides of this equation:
`x^(2) = 4`. Now you can find the square root (
`√(x)`) of both sides:
`x = 2`.

Plug the value of
`x` into the second equation:
`f(x+3)=f(5)`. This now turns the value of
`f(x)=x^(2) -4` into
`f(5) = 5^(2) -4`. This equation then ends up equaling
`f(5) =25-4=21`.

The answer is then 21.