Pre-Algebra Examples

 $\begin{array}{r} l = & 9 \\ w = & 8 - 12 w \end{array}$

Step 1

The area of a rectangle is equal to the length times the width.

$(l e n g t h) \cdot (w i d t h)$

Step 2

Substitute the values of the length $l = 9$ and width $w = 8 - 12$ into the formula for the area of a rectangle.

$9 \cdot (8 - 12)$

Step 3

Subtract $12$ from $8$ .

$9 \cdot - 4$

Step 4

Multiply $9$ by $- 4$ .

$- 36 w^{2}$