Question

Someone help with this math equation?? :)) http://prntscr.com/d655d4

Answer 1

@jhonyy9

Answer 2

jhonyy9 hence is correct

Answer 3

number 9 is coorect? lol :))

Answer 4

so than you know that before (fog)(x) = f(g(x))

now how you think that will be (gof)(x) = ?

Answer 5

(gof)(x) = g(f(x)) = ?

Answer 6

well it says what is the value of (g o f)(4)?

Answer 7

f(x) = 4x-7
g(x) = x+3

g(f(x)) = (f(x)) +3 = ?

Answer 8

so first you need to know what will be g(f(x)) = ?

Answer 9

i have no clue sorry

Answer 10

or you can solve it in 2 ways
second way is what you wrote first get f(4) = ? and than just calculi g(f(4)) = ?

Answer 11

do you understand me ?

Answer 12

@ana_98 your from peeranswer

Answer 13

yes?? how'd you find me here??

Answer 14

no i dont get it at all

Answer 15

can you get f(4) = ?

Answer 16

well i made a account which is bonnieisflash and i made a account on here to

Answer 17

bonnieisflash was on peeranswer

Answer 18

f(4)= 4? idk grrrrr

Answer 19

wth is happening to my brain

Answer 20

f(x) = 4x-7 so f(4) = 4*4 -7 = ?

Answer 21

f(x)=4x-7
f(4)=4(4)-7=9

(g o f)(4)=g(f(4))=g(9)

g(x)=x+3
g(9)=9+3=12

Answer 22

agree with 12

Answer 23

thank you @jhonyy9

Answer 24

yw. but ana do you understand the way how you can solving same exercises ?

Answer 25

i dont understand your speech

Answer 26

@amorfide please dont give dirrectly answers - try collaborate step by step with asker to tech the way how can solving the posted question

thank you

Answer 27

f(x)=ax+b
f(c)=a(c)+b
f(3)=a(3)+b
hence, you just substitute the variable, to be that number.

(g o f)(x)=g(f(x))
(f o g)(x)=f(g(x))

hence, you always work from the right, and make your way to the left, meaning you do the first function of x first, then the second function of that answer

so

(g o f)(4)=g(f(4))

if that makes sense to you

Answer 28

to teach the way - sorry

do you agree it @mathmate ?

Answer 29

I gave step by step and an answer, I didn't give a direct answer, but I will in future let them do the answer, and just give the steps, sorry

Answer 30

makes sense @amorfide thanks so much :))

Answer 31

ok. thank you

Answer 32

ana do you have again questions ?

Answer 33

yes @jhonyy9 i do

Answer 34

http://prntscr.com/d65dv1

Answer 35

idk if that one went through alright so here it is again http://prntscr.com/d65egs

Answer 36

please repost it on the open question column

do you know what mean f^-1(x) ?

Answer 37

this is the inverse of f(x)

Answer 38

ok