Calculus Examples

$\sum_{x = 1}^{8} x e^{- x}$

Step 1

Expand the series for each value of $x$ .

$1 e^{- 1 \cdot 1} + 2 e^{- 1 \cdot 2} + 3 e^{- 1 \cdot 3} + \dots + 8 e^{- 1 \cdot 8}$

Step 2

Simplify the expanded form.

$0.91880289$