Question

Help!?! Use the functions to answer the question.

Answer 1

use the definition
\[ (f\circ g)(4)=f(g(4)) \]
first g(4)=?

Answer 2

I think that's the answer.. am I right?

Answer 3

no. since g(x)=x+3 then g(4) means you replace the "x" by 4 so
\[ g(4)=4+3=7 \]

Answer 4

got it?

Answer 5

ohhhh

Answer 6

now u know that g(4)=7. so
\[ (f\circ g)(4)=f(g(4))=f(7)= \]
so f(7)=?

Answer 7

14?

Answer 8

how do I find it?

Answer 9

do the same. \(f(x)=4x-7\) so
\[ f(7)= \]

Answer 10

subtract both sides?

Answer 11

for instance
\[ f(5)=4\cdot5-7=20-7=13 \]

Answer 12

oh wait but that's not a choice

Answer 13

I'm confused :/

Answer 14

do it. it's easy f(7)=?

Answer 15

i gave u an example. with 5 instead of 7. you do it with 7

Answer 16

\[ f(\color{red}{5})=4\cdot\color{red}{5}-7=20-7=13 \]

Answer 17

so what do I do with 13?