Question

Did I set this equation up correctly??
Let f(x) = -2x - 7 and g(x) = -4x + 3. Find (f o g)(-5)

A.
3

B.
23

C.
-9

D.
-53
(-2x-7)*(-4x+3)(5) <----That's what I did.

Answer 1

@ikram002p

Answer 2

f o g)(-5) means f after g of -5
(f o g)(-5) =f (g(-5) )
first find g(-5) could you do that ?

Answer 3

I don't even know.

Answer 4

g(x) = -4x + 3
to find g(-5) replace x with -5

Answer 5

Ok. It's
g(-5)=-4x+3

Answer 6

Let me solve it and tell you what I got.

Answer 7

well on the other side also u have x replace it with -5
g(-5)=-4(-5)+3

Answer 8

oh, wait. just Kidding. I don't know what to do next. I'm kind of stuck.

Answer 9

Ok. This is what I got.
G-5=23

Answer 10

Would I add 5 to both sides?

Answer 11

no its enough u have g(-5) is 23 :)

Answer 12

Ok. Now what do I do?

Answer 13

ok nw lwts continue
(f o g)(-5) =f (g(-5) ) = f(23 )

right ?
find f(23 )
f(x)== -2x - 7

Answer 14

So..I would replace the x with 23 right?

Answer 15

sure :)

Answer 16

f(23)=-2(23)-7
f(23)=-46-7
f(23)=-53.
Is that right?

Answer 17

that is correct \(\checkmark \)

Answer 18

Haha:D Ok. Is that all what we have to do? Or is there more to it?

Answer 19

no its all/;p

Answer 20

Hahha!!:D Ok. I thought it was like some kind of long problem;) Thanx sooooooooooo much for your time!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
\(\huge\cal\color{lime}{Thank~you!!!}\) \(\huge{\leftarrow}\)

Answer 21

np :)