### Home > PC > Chapter 1 > Lesson 1.3.2 > Problem1-121

1-121.

Factor each of the following expressions.

1. $4x^{2} − 9y^{2}$

This is the difference of two perfect squares.

$\left(2x - 3y\right)\left(2x + 3y\right)$

1. $8x^{3} − 2x^{7}$

Factor out the common factors first.

$2x^3(4-x^4)$

Now you have a difference of two perfect squares. Factor again.