### Home > CCA > Chapter 3 > Lesson 3.3.1 > Problem3-81

3-81.

Find each of the following products by drawing and labeling a generic rectangle or by using the Distributive Property. Homework Help ✎

a.$−4y(5x+8y)$

• Make and label a generic rectangle.

• Fill in the boxes, and then add the boxes' labels together

• −20xy − 32y2

1. $9x(−4+10y)$

• Distribute the 9x over each of the terms in the parentheses.

• 9x(−4) + 9x(10y)

• Simplify.

• −36x + 90xy = 90xy − 36x

1. $(x^2−2)(x^2+3x+5)$

• Try using a generic rectangle to solve this problem.

• x4 + 3x3 + 3x2 − 6x − 10