Question

I have to find f(3)

Answer 1

f(3)=21

Explanation:

this is quite simple. To start off the equation is

`f\left(x\right)=2x^2+x`

All you do now is just plug 3 into x because you are trying to find f(3).

`f\left(3\right)=2\left(3\right)^2+3`

after that you simplify it to

`f\left(3\right)=2\left(9\right)+3`

Then you multiply.

`f\left(3\right)=18+3`

after that, the final step is just to add :)

`f\left(3\right)=21`

therefore, the final answer is:

`f\left(3\right)=21`

I hope this helps!

Answer 2

Explanation:

plug 3 into x

2(3)^2+(3)

2(9)+3

18+3

21

f(3)=21