Math Question: Regarding Functions

A function is defined by the equation f(x) = 2x^2 – x + 4

Evaluate the given function for the given value.

f(4) :

I came up with:
f(4) = 2(4)^2 - 4 + 4
= 36 - 4 + 4
4-4= 0

So f(4) = 36

Is that correct? If not, can you show me where I went wrong?

Thanks in advance!

f(4)=2(4)^2-4+4=
f(4)=2(16)-4+4=
f(4)=32-4+4=
f(4)=28+4=
f(4)= 32

You should have got 32.

f(4)= 2(4)^2 - 4+4 = 2(16)= 32.

f(4)= 2(4)^2 - 4 +4
= 8^2 - 0
=64

f(4) = 64

Where you've written 36, you should have written 32.