Question

Let f(x) = 2x - 6. Solve f-1(x) when x = 2.

-5

4

-2

7

Can anyone plz help me out? @texaschic101 @phi @Compassionate @radar @Loser66 @Preetha

Answer 1

i got C

Answer 2

do you know how to get the inverse function?

Answer 3

you found f(x) which is different from f^-1(x)

Answer 4

oh ok but idk how to find for the inverse.

Answer 5

the way people are taught is to "swap x and y" in f(x)
you start with
y= 2x - 6

and swap x and y to get
x= 2y - 6

if we "solve for y" we will find f^-1(x)

we would add + 6 to both sides
x+6= 2y
then divide both sides by 2
(x+6)/2 = y

now put in x=2 into that formula to find the answer.

Answer 6

Thank you so much!!! @phi

Answer 7

yw

Answer 8

Let f(x) = -4x + 7 and g(x) = 10x - 6. Find f(g(x)).

-40x + 24

-40x + 31

-40x + 64

-40x + 70
How would I solve for this one? @phi

Answer 9

@kirbykirby can u plz help me out?

Answer 10

@texaschic101 @phi @Compassionate @radar @Loser66 @Preetha