Precalculus Examples

$\sum_{x = 2}^{2} \frac{2}{x} - 4 x$

Step 1

Expand the series for each value of $x$ .

$\frac{2}{2} - 4 \cdot 2$

Step 2

Simplify.

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Step 2.1

Simplify each term.

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Step 2.1.1

Divide $2$ by $2$ .

$1 - 4 \cdot 2$

Step 2.1.2

Multiply $- 4$ by $2$ .

$1 - 8$

Step 2.2

Subtract $8$ from $1$ .

$- 7$

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