Question

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

Answer 1

Now, in place of x, you'll have to substitute 3. So,
f(3)=2*3^2+3
=2*9+3
=18+3
=21.

Answer 2

The answer is f(3)=21.

Explanation:

To solve this we have to replace the x value in the proposed equation with a value of 3.

`f(x)=2x^(2) +3\\x=3\\Replacing\\f(3)=2*3^(2) +3\\f(3)=2*9+3\\f(3)=18+3\\f(3)=21\\`

Having replace the value we have that f(3)=21.