# Average Rate Of Change Formula

#### bwpbruce

##### Member
Is this the correct symbol to use for average rate of change:
$$\displaystyle \overline{\triangle}=\dfrac{f(b)-f(a)}{b-a}$$

#### Klaas van Aarsen

##### MHB Seeker
Staff member
The correct notation for average rate of change is:
$$\frac{\Delta f}{\Delta x} = \frac{f(b)-f(a)}{b-a}$$

#### HallsofIvy

##### Well-known member
MHB Math Helper
I would say that Greg's example is the "standard" or "usual" symbol for rate of change and that there is no "correct" symbol for anything! As long as you define your notation, there is no "incorrect" notation.