Question

Can someone see if I got the right answer?

Assume f(x)=-2x+8 and g(x)=5x. what is the value of (fog)(3)?

A. -22
B. 3x+8
C. 17
D. 29

Is it B?

Answer 1

None. can you figure out what (f o g)(x) is?

Answer 2

@geerky42 How can it be none? When I worked it out it was..
(-2(5x)+8)(3)
and my final answer was -10x+11

Answer 3

(f o g)(x) is basically same as f( g(x) )

Answer 4

okay, so you figured out (f o g)(x)

but you are asked to find (f o g)(3)

Answer 5

so you just plug in 3

Answer 6

wait, your (f o g)(x) is incorrect

Answer 7

@geerky42 So it would (-2(5)(3)+8)?

Answer 8

yep

Answer 9

which is what?

Answer 10

@geerky42 -22

Answer 11

right! gold medal for you

Answer 12

@geerky42 Thank you for helping me! :)

Answer 13

welcome :)