# Change in frequency with a small change in tension (guitar string)

1. Dec 29, 2015

### kent davidge

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

2. Relevant equations

3. The attempt at a solution

2. Dec 29, 2015

### PietKuip

$\sqrt{1+x} \approx 1 + x/2$ when $x \ll 1$

3. Dec 29, 2015

### kent davidge

ohhh thanks... I see that my answer was correct by checking my last formula with random numbers, but I'm still unable to solve it to get the expression as the problem asks. (sorry my english)

4. Dec 29, 2015

### PietKuip

It is the first terms of the series expansion of $\sqrt{1+x}$ close to 1.

5. Dec 29, 2015

### Staff: Mentor

Mentor's note: Please note that I changed the thread title to make it more descriptive of the problem. The original title was entirely too vague.