Question

If f(x) = 2x − 2 and g(x) = 3x − 1, find (f − g)(4).

17

−17

5

−5

Answer 1

@Ashleyisakitty @brookie5150 @CoughCoughAchoo @dmezzullo @experimentX @Foreverisabell

Answer 2

find f(x) and g(x) first

Answer 3

I do not understand this. I have a lot of these so if you can explain it that would be a great help.

Answer 4

how do you know what x or f or g are.

Answer 5

f(x) = 2x − 2
put x=4 and find f(4)

Answer 6

6

Answer 7

and g(4) is 11

Answer 8

so i am finding (6-11)(4)

Answer 9

I got -20 but that is not an option... did i do it wrong?

Answer 10

yes ... find f(4) - g(4) ... that's correct

Answer 11

but that is -20. My options are listed above so why does my answer not fit the options?

Answer 12

check again ... you might have made error
http://www.wolframalpha.com/input/?i=2x+%E2%88%92+2+-%28+3x+%E2%88%92+1%29+%2F.x-%3E4

Answer 13

6-11=-5
-5x4=-20

where did i make a mistake????

Answer 14

6-11=-5 <--- this is okay ... how did you get 20 ??

Answer 15

-20
I then have to multiply it by four. that makes-20

Answer 16

No no ... you don't have to multiply it by 4.
(f-g)(x) = f(x) - g(x) <--- you misunderstood this.

Answer 17

so my answer is -5.

Answer 18

yes

Answer 19

will you please help me with another?
it is similar but has the parentheses in a different place and i am not sure how that effects it?

Answer 20

sure ... post it.

Answer 21

If f(x) = 3x + 1 and g(x) = 2x − 4, find f[g(2)].

25

4

0

1

Answer 22

find g(2) first.

Answer 23

0

Answer 24

is that all i have to do for this question because f is not getting multiplied by x.

Answer 25

then find f(0)

Answer 26

well that will be zero since anything times 0 is 0

Answer 27

sorry ... f(0) = 3x0 + 1 = 1 so your answer is 1

Answer 28

ok. thanks.

Answer 29

yw ...
what is f(x) = is not f times x ... okay, this is 'x' goes inside f

Answer 30

ok. Now i understand.