- #1

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the question is

let f(x)=5+2x+5e^x

f^-1(10)=?

i keep messing up on these problems and now im not really sure where exactly 2 start...i know i gotta find the inverse but i would appreciate some help on getting started on this problem.....thx

- Thread starter sonya
- Start date

- #1

- 23

- 0

the question is

let f(x)=5+2x+5e^x

f^-1(10)=?

i keep messing up on these problems and now im not really sure where exactly 2 start...i know i gotta find the inverse but i would appreciate some help on getting started on this problem.....thx

- #2

HallsofIvy

Science Advisor

Homework Helper

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However, the problem does NOT ask you to find "f

Can you think of a value of x such that f(x)= 10 and what does that have to do with the problem?

- #3

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well....f(x)=10 when x=0

but i dont c ne relation btwn that and the inverse...

but i dont c ne relation btwn that and the inverse...

- #4

HallsofIvy

Science Advisor

Homework Helper

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Two functions (call them f and g) are "inverse" to each other (here's the "formal" definition) if and only if f(g(x))= x and g(f(x))= x for all x.

If f(x)= y, then f

Since f(0)= 10, f

Whenever f(a)= b, then f

if f: x-> y then f

- #5

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thats it?....how come it looks so simple now?....neways thx 4 clearing things up!...

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