Question

Given f (x) = x2 + 7, evaluate f (4).

Answer 1

Answer: f(4) = 23

Step-by-step explanation: Notice that f is a function of x.

So we want to find f(4).

We find f(4) by plugging 4 in for x, everywhere that x appears in the function.

So we have f(4) = (4)² + 7.

(4)² is 16 so we have 16 + 7 which is 23.

So f(4) is 23.

Answer 2

f(4) = 23

Explanation:

`f(x) = x^2 + 7`

Plug x = 4

`f(4) = 4^2 + 7`

`f(4) = 16 + 7`

`f(4) = 23`