Question

Given f(x) = 4x + 1 all over 3 solve for f-1(3).

Answer 1

2
4
6
8

Answer 2

$$
f(x)=\cfrac{4x+1}{3}
$$
And you need,
$$
f^{-1}(3)
$$
That is you need the inverse evaluated at 3?

Answer 3

im confused

Answer 4

Can you read the attached? Is this your problem?

Answer 5

yes it is

Answer 6

@ybarrap

Answer 7

ok, replace f(x) with x and x with y and solve for y.

Answer 8

That'll give you your inverse. Then plug in x=3 to the result. Done.

Answer 9

let y=f(x)=(4x+1)/3
interchange x and y
x=(4y+1)/3
4y=3x-1
y=1/4 (3x-1)
f^-1(x)=1/4(3x-1)
plug x=3 and get the solution.

Answer 10

I got 2 @ybarrap and @surjithayer

Answer 11

That's right - (1/4) (3(3) -1 ) = (9-1)/4 =8/4 = 2