Calculus Examples

$\sum_{i = 4}^{8} \frac{i!}{(i - 2)!}$

Step 1

Expand the series for each value of $i$ .

$\frac{4!}{(4 - 2)!} + \frac{5!}{(5 - 2)!} + \frac{6!}{(6 - 2)!} + \dots + \frac{8!}{(8 - 2)!}$

Step 2

Simplify the expanded form.

$160$

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$