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Precalculus Examples

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

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

Step 1

Expand the series for each value of

x

$x$ .

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

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

Step 2

Simplify.

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Step 2.1

Simplify each term.

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Step 2.1.1

Divide

2

$2$ by

2

$2$ .

1 - 4 \cdot 2

$1 - 4 \cdot 2$

Step 2.1.2

Multiply

- 4

$- 4$ by

2

$2$ .

1 - 8

$1 - 8$

1 - 8

$1 - 8$

Step 2.2

Subtract

8

$8$ from

1

$1$ .

- 7

$- 7$

- 7

$- 7$

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

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