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

12-86.

3*x* is a common factor.

Use a generic rectangle.

(3*k* + 10)(*k* + 1)

See part (b).

This is a difference of squares.

12-86.

3*x* is a common factor.

Use a generic rectangle.

(3*k* + 10)(*k* + 1)

See part (b).

This is a difference of squares.