Question

If f(x) = 2x^2 + 4, find f(3)

Answer 1

f(3)=2(3)^2+4

f(3)=2(9)+4

f(3)=18+4

f(3)=22

Explanation:

In this scenario, x=3 so you plug it into the other side of the equation.

Answer 2

`f(3) = 22`

EXPLANATION

The given given function is

`f(x) = 2 {x}^(2) + 4`

To find f(3), we substitite x=3 into the function f(x).

This means that wherever we see x in

`f(x) = 2 {x}^(2) + 4`

we replace it with 3 .

`\implies \: f(3) = 2 ({3})^(2) + 4`

We evaluate the square to get:

`\implies \: f(3) = 2 ({9}) + 4`

Perform the multiplication

`\implies \: f(3) = 18 + 4`

Now add to get:

`\implies \: f(3) = 2 2`