Math Is Fun Forum

apiece

Member

Registered: 2013-03-20

Posts: 1

Help me to solve this plz!

Help me to solve this plz!
If
g(x)=2-5f(3x) & f'^(-1)(0)=5

g'^(-1)(2)=?

A)-0.33
B)0.66
C)0.33
D)-0.66
tnx

Bob

Administrator

Registered: 2010-06-20

Posts: 10,646

Re: Help me to solve this plz!

hi apiece

Welcome to the forum.

g(x)=2-5f(3x)

OK. I get that.

f'^(-1)(0)=5

Do you  mean the inverse function for f evaluated at x = 0, is 5  ?

The second image doesn't say this.

g'^(-1)(2)=?

Do you mean differentiate g, construct the inverse function, then evaluate it at x = 2    ?

That's not what you've got in the third image.

And now I think about it, by writing function^-1 do you mean the inverse function at all, or the reciprocal function

eg.  does sin^-1 mean arcsin or 1/sin ?

Bob

Last edited by Bob (2013-03-20 06:21:45)

---

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob