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

Question

asked Jun 17, 2020 155k views

2 Answers

Gerhard · Answer 1 · 2020-06-19T11:02:53+0000

Answer:

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.

Harben · Answer 2 · 2020-06-23T01:08:57+0000

ANSWER

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:

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