Chemistry Examples

$- 7 r - 2 (- 4 - 9 r)$

Step 1

Simplify each term.

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Step 1.1

Apply the distributive property.

$- 7 r - 2 \cdot - 4 - 2 (- 9 r)$

Step 1.2

Multiply $- 2$ by $- 4$ .

$- 7 r + 8 - 2 (- 9 r)$

Step 1.3

Multiply $- 9$ by $- 2$ .

$- 7 r + 8 + 18 r$

$- 7 r + 8 + 18 r$

Step 2

Add $- 7 r$ and $18 r$ .

$11 r + 8$

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