Question

help with algebra 1 chapter 12 chapter wrap up Find the indicated outputs for these functions. 3. f ( x ) = 3x - 4 ; find f ( 2 ) , f ( 0 ) , and f ( -1 )

Answer 1

Given the function:

$f(x)=3x-4$

• You need to substitute this value of "x" into the function and then evaluate:

$x=2$

In order to find:

$f(2)$

Then, you get:

$f(2)=3(2)-4=6-4=2$

• Substitute this value of "x" into the function and then evaluate:

$x=0$

In order to find:

$f(0)$

You get:

$f(0)=3(0)-4=-4$

• Now you need to substitute this value of "x" into the function and then evaluate:

$x=-1$

In order to find:

$f(-1)$

You need to remember the Sign Rules for Multiplication:

$\begin{gathered} (+)(+)=+ \\ (-)(-)=+ \\ (-)(+)=- \\ (+)(-)=- \end{gathered}$

Then, you get:

$f(-1)=3(-1)-4=-3-4=-7$

Hence, the answer is:

$\begin{gathered} f(2)=2 \\ f(0)=-4 \\ f(-1)=-7 \end{gathered}$