Question

If f(x) = x2 + x and g(x) = x − 3, find f(g(7)).
20
28
32
53
@geerky42

Answer 1

Do same as before, find the value of g(7).

Answer 2

\[g(\color{red}{7}) = \color{red}{7}-3=~?\]

Answer 3

I'm sure you can do this.

Answer 4

4?

Answer 5

Yep.

So \[f(\color{red}{g(7)}) = f(\color{red}{4})\]

What is f(4)?

Answer 6

28?

Answer 7

\[f(\color{red}{4})=\color{red}{4}^2+\color{red}{4}\]

Answer 8

20!

Answer 9

Right!