Question

If f(x)=4x^2-6

find f(3)

Answer 1

`f(3)=30`

Explanation:

So we have the function:

`f(x)=4x^2-6`

To find f(3), substitute 3 for x. Thus:

`f(3)=4(3)^2-6`

Square:

`f(3)=4(9)-6`

Multiply:

`f(3)=36-6`

Subtract:

`f(3)=30`

And we're done!