Precalculus Examples

$\sum_{k = 12}^{9} 6 k + 6$

Step 1

Since the summation's lower limit is greater than the summation's upper limit, it is an empty summation and its value is defined to be zero.

$0$

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