Question

Let f(x)=-2x-7 and g(x)=-4x+3. Find (fog)(-5)

Answer 1

You need to put the g function in f and then substitute the value of x with 3.
ie.
f(g(x)) = 2(-3x -7) -6
fog= -6x -20
fog(3)= -6*3 -20
fog(3)= -38

2. log(5x + 14) =0
take the log in RHS
(5x + 14)= e^0
5x + 14= 1
=> x= -13/5

Hope this helps.

Answer 2

:P

Answer 3

I hope I helped

Answer 4

let me just process this, lol

Answer 5

Lol

Answer 6

wait, where did you get the 3?

Answer 7

What 3

Answer 8

the three here: You need to put the g function in f and then substitute the value of x with 3.

Answer 9

I have this in my notes I have no Idea

Answer 10

Its been a while

Answer 11

oh lol

Answer 12

Lol

Answer 13

Start with the given property

Plug in f%28x%29=x%5E2-6x%2B9 and g%28x%29=x-3

Group like terms


Combine like terms



So

Answer 14

oops

Answer 15

Here look http://prntscr.com/b9o36f

Answer 16

lol

Answer 17

That might help

Answer 18

um this is a different type of question

Answer 19

its another one to see

Answer 20

to kinda help a little more

Answer 21

it is (f-g)

Answer 22

Opps I cut something outon my 1 answer

Answer 23

o means (of) i.e. f of g i.e. f(g(x)). Here you go.
You need to put the g function in f and then substitute the value of x with 3.
ie.
f(g(x)) = 2(-3x -7) -6
fog= -6x -20
fog(3)= -6*3 -20
fog(3)= -38

2. log(5x + 14) =0
take the log in RHS
(5x + 14)= e^0
5x + 14= 1
=> x= -13/5

Hope this helps.

Answer 24

Ok

Answer 25

i'm still kinda lost, but thanks anyways

Answer 26

Im sorry I could not help u a lot

Answer 27

its ok, at least you tried :)

Answer 28

Ya I guess

Answer 29

Make sure who ever helps u fully gets a medal!

Answer 30

I wanna give you a medal for your kindness

Answer 31

\[\left( fog \right)x=f \left\{ g \left( x \right) \right\}=f \left( -4x+3 \right)=-2\left( -4x+3 \right)-7=8x-13\]
\[\left( fog \right)\left( -5 \right)=8*-5-13=-53\]

Answer 32

aww ty @juan1857

Answer 33

oh so do we practically just insert either g or f as x for the other?

Answer 34

Yep

Answer 35

ahh! Now I see

Answer 36

Dont forget to medal whoever u think earned it

Answer 37

I won't :)

Answer 38

Ok :)

Answer 39

ty

Answer 40

my pleasure