Question

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

@jigglypuff314

Answer 1

-1 -7(-1) - 9?

Answer 2

yes, that's almost the first step! :)

it would be (-1)^2 -7(-1) - 9

Answer 3

jiggly puff is correct

Answer 4

jiggly puff is correct

Answer 5

ok:) sorry i was taking care of my dogs

Answer 6

(-1)^2 -7(-1) - 9
so it would be 1 - 7 - 9 = -15

Answer 7

careful! :)
-7(-1) would become +7
so 1 + 7 - 9 = ?

Answer 8

it would equal 1?

Answer 9

or -1

Answer 10

-1 would be more correct :P

then plug in -1 for x into x - 2
so -1 - 2 = ?

Answer 11

-3?

Answer 12

Correct! :D Great Job! ^_^

Answer 13

thank you i have a couple more:/

Answer 14

Let f(x) = thirty/ 3 x - 2. Find f(-2).

Answer 15

erm... is it
(30/3) x -2
or 30 / (3x-2) ?

Answer 16

-2= 30/3-2
-2 = 30/ 1
-2 = 30
30/-2 = -15?

Answer 17

it is 30/(3x-2)

Answer 18

hmmm ok
then 30/(3(-2) -2) and use order of operations

Answer 19

30/(3(-2(-2)
30/-12?

Answer 20

30/(3(-2) -2) as in 30/ (-6 - 2) -> 30 / (-8)

Answer 21

-3?

Answer 22

mmm I don't get a whole number :/

Answer 23

i get -3.75 but i dont think that its

Answer 24

it's what I got... but if you think it's wrong, then the set up might have not been correct

Answer 25

f(g(x))) = (x^2 - 7x - 9) - 2 = x^2 - 7x - 11

Plug in -1 in for x and that's f(g(-1))

Answer 26

Omagawsh /_\ You're on a different problem D:

Answer 27

lol yeah @tHe_FiZiCx99 xD sorry about that

Answer 28

I got -3.75 with what jiggly wrote

Answer 29

i did too

Answer 30

Ye ^ If you're rounding then that would be -3.6 ♦_♦ Depends how you chose to round :3

Answer 31

i think so i have 2 more questions

Answer 32

Let f(x) = 7x - 13. Find f-1(x).

Answer 33

try posting it as a new question post so we don't confuse more people :P

Answer 34

ok i will