Pre-Algebra Examples

 $\begin{array}{r} l = & x - 11 \\ w = & x \end{array}$

Step 1

The perimeter of a rectangle is equal to the sum of all sides of the rectangle.

$l e n g t h + l e n g t h + w i d t h + w i d t h = 2 \cdot (l e n g t h) + 2 \cdot (w i d t h)$

Step 2

$2 \cdot 2 \cdot x$

Step 3

Multiply $2$ by $2$ .

$4 x \cdot x - 11$