Precalculus Examples

$\sum_{k = 4}^{8} 3 k - 2$

Step 1

Expand the series for each value of $k$ .

$3 \cdot 4 - 2 + 3 \cdot 5 - 2 + 3 \cdot 6 - 2 + \dots + 3 \cdot 8 - 2$

Step 2

Simplify the expanded form.

$80$