### Home > A2C > Chapter 12 > Lesson 12.2.1 > Problem12-86

12-86.

Factor each of the expressions below, if possible.

1. $3x^{2} − 18x$

3x is a common factor.

1. $3k^{2} + 13k + 10$

Use a generic rectangle.

$\left(3k + 10\right)\left(k + 1\right)$

1. $6m^{2} − 13m − 5$

See part (b).

1. $9t^{2} − 25$

This is a difference of squares.