### Home > CAAC > Chapter 7 > Lesson 7.3.4 > Problem 7-112

7-112.

First figure all of the dimensions of the rectangle by dividingthe known area by the given side.

10*xy* divided by 5*x* is 2*y*.

To show the area as a product, write the dimensions multiplied together.

(2*y* + 4)(5*x* + 3)

Find the areas of all of the sections by multiplying the dimensions together, then add the areas to express as a sum.

6*y* + 20*x* + 10*xy* + 12

Use the same method from part (a) to solve part (b).