Question

What is the inverse of f(x) = 2x − 8?

Answer 1

To find the inverse of a function you are first gonna need to replace f(x) with y.
Then you have to flip the x and y variables and solve for y. @sherlocked1270

Answer 2

follow the steps
http://www.coolmath.com/algebra/16-inverse-functions/05-how-to-find-the-inverse-of-a-function-01

Answer 3

f(x) = 2x − 8
y = 2x − 8
x = 2y − 8
x+8=2y and so on..

Answer 4

wait so what do I do after I get to x=2y+1

Answer 5

you solve for y

2y=x-1
y=(x-1)/2

Answer 6

\(\color{blue}{\text{Originally Posted by}}\) @sunleaf01
f(x) = 2x − 8
y = 2x − 8
x = 2y − 8
x+8=2y and so on..
\(\color{blue}{\text{End of Quote}}\)
After this step we are supposed to divide 2 throughout the equation.

Answer 7

can someone help me with my question http://openstudy.com/updates/55a65b2be4b0f93dd7c4162d

Answer 8

how do I remove the parentheses from Y=(x-1)/2

Answer 9

how did u get tht???
y = 2x + 8
switch x and y
x = 2y + 8
x - 8 = y
x/2 - 4 = y
now stick inverse notation

Answer 10

there's an error.
Everything is fine until x+8=2y
divide 2 throughout the entire equation to have y by itself
the fraction part is correct, but we should have a 4

Answer 11

ok I'm going on break see u later

Answer 12

u will get x - 8 = 2y
so
(x - 8)/2 = y
x/2 - 8/2 = y
x/2 - 4 = y

Answer 13

@rishavraj i ony saw sherlocked questin with x=2y+1 haha my bad i didnt see ur guys responses

Answer 14

that's alright. mistakes do happen ^^

Answer 15

and can anyone help with this http://openstudy.com/updates/55a65b2be4b0f93dd7c4162d

Answer 16

so u were saying that you have to get rid of the F(x) but in the answers that are provided It has f(x)
f^-1(x)=1/2x-8
f^-1(x)=1/2x+4
f^-1(x)=1/2+8
f^-1(x)=2x+16

Answer 17

hey

Answer 18

hi

Answer 19

see my just previous reply...
i ended with y = x/2 + 4
replace y from f^-1(x)
so it woud be
f^-1(x) = x/2 + 4

Answer 20

oh ok thank u :D

Answer 21

u welcome :))))

Answer 22

ans is x+8
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2