Question

Let f(x) = 9x - 2 and g(x) = -x + 3. Find f(g(x)) HELP? MEDAL AWARD

Answer 1

f(x) = 9x - 2
g(x) = -x + 3
f(g(x)) = 9(g(x))-2
= 9(-x+3)-2
=-9x+27-2
=-9x+25

Answer 2

i have a few more ?'s can u help me w them too

Answer 3

let f(x) = x - 2 and g(x) = x2 - 7x - 9. Find f(g(-1))
??

Answer 4

i have to go fairly soon, ill be back on in about 3 hours if you are still on then.
i can try to solve maybe one or two in the next 5 minutes

Answer 5

that's all the time i need

Answer 6

f(x) = x - 2
g(x) = x2 - 7x - 9
g(-1) = 2(-1) - 7(-1) - 9
g(-1) = -2 +7-9
g(-1) = -4
f(g(-1) = f(-4)
f(-4) = -4 - 2
= -6

Answer 7

so f(g(-1)) = -6

Answer 8

-6 isnt an option
-21
-3
3
21

Answer 9

f(x) = x - 2
g(x) = x2 - 7x - 9
g(-1) = 2(-1) - 7(-1) - 9 Error is on this line. (-1)^2 =1 not -2
g(-1) = -2 +7-9
g(-1) = -4
f(g(-1) = f(-4)
f(-4) = -4 - 2
= -6

Answer 10

hmm, f(g(x)) = (g(x)) - 2
= 2x - 7x - 9 - 2
= -5x -11
= -5(-1) - 11
= 5-11
= -6

im not sure how this is so, could the book possibly be wrong?

Answer 11

no lol

Answer 12

oh, he meant to the power of 2, i didn't realize. i have to go know do u think u could help him from here for me, radar?

Answer 13

i am a her. lol

Answer 14

f(x) = x - 2
g(x) = x2 - 7x - 9
g(-1) = -1^2 - 7(-1) - 9
g(-1) =1 +7-9
g(-1) = -1

Answer 15

f(x) = x - 2
f(g(-1) = -1 - 2 = -3

Answer 16

@alwaysright13, did you see the error which gave a -6 that should be a -1??

Answer 17

yes i did. what about this one ????Let f(x) = x + 8 and g(x) = x2 - 6x - 7. Find f(g(2)).

Answer 18

Just repeat the steps using the new function and the new value of 2.
g(2)=2^2 - 6(2) -7. Do you see this is the g(x) functrion with 2 substituted for x?

Answer 19

This now becomes g(2) = 4 - 12 - 7 = -15 or g(2) = -15 we now use this in the f(x)
f(x)=x + 8
f(-15)=-15+8 = -7.

Please post any additional problems as a new problem.