Question

"f(x) = 5x + 2, g(x) = 2x - 1
Find (f o g)(x)" What does this mean?

Answer 1

it means
f(g(x))

Answer 2

means value of g(x) is placed in function f

Answer 3

f(g(x))=f(2x-1)=5*(2x-1)+2

Answer 4

got it ??

Answer 5

g(x) is NOT 2x - 1.

It is given that 5x + 2g(x) = 2x - 1.

Therefore,\[2g(x) = 2x - 1 - 5x = -3x - 1\]\[\iff g(x) = \dfrac{-3x-1}{2}\]

Answer 6

Comment.

Answer 7

French?

Answer 8

g=2x-1

Answer 9

No, f(x) = 2x - 1.

Answer 10

i think you didnt read the Q properly

Answer 11

@ganeshie8 Please confirm.

Answer 12

It is a composite function so you plug in.
SO:
"f(x) = 5x + 2g(x) = 2x - 1 Find (f o g)(x)" What does this mean?

It is saying that okay, you have two equations

First is F(x) = 5x +2
And the second equation" G(x) = 2x-1
So that f circle g is
F Of G of X

so find the g equation substituted x for x.

G(x)= 2x-1
you cant change because its x.

then plug this is because it is the answer to plugging in x for x.

SO

F(G which is 2x-1) =
5(2x-1) +2
Do algebra.

10x-5+2
10x-3 is your answer:)

Answer 13

Oh, wait.

Answer 14

Looks like the question poster forgot a space or a line break.

Answer 15

lol yeah

f(x) = 5x + 2g(x) = 2x - 1

technically gives f(x) = 2x-1
g(x) = (-3x-1)/2

Answer 16

f(x) = 5x + 2, g(x) = 2x - 1

Answer 17

^ that's probably what they meant

Answer 18

makes more sense, let me edit the question :)

Answer 19

lololol