Question

using f(x) = 3x - 3 and g(x) = 2x, what is f(4) - g(2) ?
a. 5
b. -5
c. 10
d. -10

**May someone explain how to work this problem..

Answer 1

a. 5

Answer 2

3(4)-3=12-3=9 2(2)=4 9-4=5 which gives you a final answer of 5

Answer 3

\(\Large\color{black}{ f(4)}\) means that you plug in \(\Large\color{black}{ 4}\) into f(x) for x.

For example, f(2)
\(\Large\color{black}{ f(2)=3(2)-3~~~~=6-3~~~~=3}\)
So can you find f(4), (the same way) ?


Similarly, g(2) means that you plug in 2 into g(x) ....
so, for example, g(5)
\(\Large\color{black}{ g(5) = 2(5)~~~=10}\)
Can you find g(2) ?

Answer 4

After you find f(4) and g(2), substitute the found values, into "f(4) - g(2)"