Question

Let f(x) = 2x + 2. Solve f-1(x) when x = 4.

Answer 1

that means solve
\[2x+2=4\] should easy enough right?

Answer 2

but inverted...

Answer 3

f^-1(x)

Answer 4

yeah i know

Answer 5

you are not plugging in 4, you are solving for x if \[2x+2=4\]

Answer 6

takes two steps, subtract 2, divide by 2

Answer 7

no, when it says to solve for x=2 you insert 2 for x:
f(4)=2(4)+2

Answer 8

x = 1 ?

Answer 9

trust me on this
let me know what you get then i will show you why that answer is right

Answer 10

er x =4

Answer 11

i got x = 1 @satellite73

Answer 12

?

Answer 13

yes \(x=1\)

Answer 14

that means that
\[f^{-1}(4)=1\]in other words if \(f(x)=2x+2\) then \(f(1)=4\) which is true