# Homework Help: Proof involving the mean value theorem and derivatives

1. Jan 17, 2012

### imurme8

1. The problem statement, all variables and given/known data

For $\mu\geq 0, s\geq 1,$ prove that $(1+s)^{\mu}\geq 1 + s^{\mu}$

2. Relevant equations

3. The attempt at a solution

I have written a proof involving the mean value theorem and derivatives, but there must be a simpler way! I think this should be done purely algebraically. Instructor insists that $\mu$ is an arbitrary non-negative real number, not just a rational or an integer. So to define it we need log, etc. But I believe there is a solution that does not go into this...

2. Jan 17, 2012

### imurme8

Re: ddd

Forgot to say, no binomial theorem allowed

3. Jan 17, 2012

### imurme8

Re: ddd

Whoops, meant $\mu \geq 1$ and $s\geq 0$, not the other way around. However, they are both reals.

4. Jan 17, 2012

### LCKurtz

Re: ddd

What does this question have to do with the subject "ddd" of the thread?

5. Jan 17, 2012

### imurme8

Re: ddd

Whoops, meant $\mu \geq 1$ and $s\geq 0$, not the other way around. However, they are both reals.

6. Jan 17, 2012

### imurme8

Re: ddd

I apologize, I forgot to enter a thread name that makes sense. If we can delete this one and repost it, I'd be happy to.

7. Jan 17, 2012

### Staff: Mentor

Re: ddd

(I changed the thread title for you.)

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