### Home > GC > Chapter 3 > Lesson 3.2.6 > Problem3-100

3-100.

The area of the rectangle shown at right is $40$ square units. Write and solve an equation to find $x$. Then find the dimensions of the rectangle.

 left edge top $+5$ left edge bottom $x$ bottom edge left $x$ bottom edge right$+2$

Complete the multiplication in the generic rectangle. The sum of the small rectangles is $40$ square units.