### Home > INT2 > Chapter 4 > Lesson 4.2.3 > Problem4-85

4-85.

Factor each expression, if possible. Identify any special cases, such as a difference of squares or a perfect square trinomial.

1. $4 x ^ { 2 } - 49$

This is a difference of squares.

1. $2x^2+11x+12$

Use an area model and a Diamond Problem.

$(2x+3)(x+4)$

1. $4x^2+25$

Not factorable. Why?

1. $9x^2+6x+1$

What is special about the first and third terms?

1. $xy−4y+2x−8$

See part (b).

1. $x^4−16$

See part (a).
Remember to factor completely.