# What does '' mean in f''(x)?

Tags:
1. Mar 29, 2016

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

2. Relevant equations
The Quotient rule for calculating the derivative.

3. The attempt at a solution
The derivative f'(x) = (x+5)-(x+3) / (x+5)^2
I tried a previous similar problem but failed as I didn't and still don't know what '' means.

2. Mar 29, 2016

### blue_leaf77

$f''(x)$ is the derivative of $f'(x)$.

3. Mar 29, 2016

### gleem

f"(x) is the second derivative of f(x)

4. Mar 29, 2016