### Home > AC > Chapter 14 > Lesson 14.3.1.2 > Problem3-29

3-29.

Factor each expression completely.

1. $x^{2} − 49$

$\left(x + 7\right)\left(x − 7\right)$

1. $4x^{2} − 1$

1. $x^{2}y^{2 }− 81z^{2}$

$\left(xy + 9z\right)\left(xy − 9z\right)$

1. $2x^{3} − 8x$

Remove the common factor and then factor the quadratic.