### Home > CCA2 > Chapter 5 > Lesson 5.2.3 > Problem 5-91

Factor each expression below.

Look for a greatest common factor.

This is the difference of squares:

If you need more help, look up difference of squares in the glossary or find your class work from Lesson 3.1.2.

Always start by looking for a greatest common factor.

Can you factor the polynomial further?

Use a generic rectangle. Remember that the products of the diagonals must be equal.

. Image of 2 by 2 rectangle.

Start by filling in the first and last terms.

Added to interior labeled, top left, 3, x squared, bottom right, negative 4.

What two numbers multiply to

and add to ? Added to rectangle, interior labels, top right, 1, x, bottom left, negative 12, x. Find the greatest common factor for each row and column.Added to rectangle, labels, left edge, top & bottom, each with question mark, bottom edge, left, 3, x, right, + 1.