Question

What is the value of f(3) when f(x) = 4x + 1

Answer 1

F(x)= 4x+1

To find f(3) you substitute it into x.

F(3)= 4(3)+1

F(3)=12+1

F(3)=13

Answer 2

Here is the equation:

$f(x)=4x+1$

You need to find f(3). To do that, substitute all the x's with 3:

$f(x)=4x+1 \rightarrow f(3)=4\times3 + 1$

The first thing you need to do is multiply 4 by 3. Multiply:

$4 \times 3 = 12$

Here is your new equation:

$f(3)=12+1$

To get your answer, you need to add 12 and 1. Add:

$12+1 = 13$

That means:

$\bf f(3)=13$

If you have any questions, feel free to ask in the comments! :)