Recall when finding the slope of two points, we use the formula

Since the slope is the derivative, we can actually use this formula to estimate derivatives from a table.

We will just readjust the slope formula to look like this:

$f'(a) \approx \frac{f(a+h) - f(a)}{h}$

Use this when estimating the slope of the very **first** point of the table

$f'(a) \approx \frac{f(a+h) - f(a-h)}{2h}$

Use this when estimating the slope of **middle** points of the table

$f'(a) \approx \frac{f(a) - f(a-h)}{h}$

Use this when estimating the slope of the very **last point** of the table

**Note that we will not use these formulas in the videos. We will just use the simple slope formula.**