Question

Let f(x)=5x-4 and g(x)=x^2-1. Find each value.
1) \[f(g(\sqrt{6}))\]

2) f(g(0))

3) \[g(f(4/5))\]

Answer 1

@dumbcow can you help

Answer 2

how 'bout me?

Answer 3

you can too :)

Answer 4

f(x)=5x-4 and g(x)=x^2-1

#1 f(g(sqrt6)) =
lets find g(sqrt6). Can you calculate it?

Answer 5

dpalnc will help you :)

Answer 6

(square root of 6)^2-1=5?

Answer 7

good. now with this answer, stick it into f(x)

Answer 8

21

Answer 9

ok. #2 looks easy what's your answer?

Answer 10

take your time...

Answer 11

I got -9

Answer 12

good. the third one shouldn't be too tough.. what do you have for f(4/5)?

Answer 13

-1

Answer 14

is that your answer for #3 or my previous question?

Answer 15

#3

Answer 16

then you're done! good job.
remember in composition of functions, figure out the "inside" function first then put it on the "outside" function.