Question

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

find f(3)

Answer 1

Answer:

$f(3)=30$

Step-by-step 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!