### Home > INT2 > Chapter 4 > Lesson 4.1.3 > Problem4-28

4-28.

Factor the following expressions, if possible. Homework Help ✎

1. $k^2-12k+20$

Use an area model and a Diamond Problem.

2. $6x^2+17x−14$

$(2x+7)(3x−2)$

3. $x^2-8x+16$

4. $9m^2-1$

Insert a $0m$ between the $9m^2$ and the $−1$.

5. The expressions in parts (a) through (c) are trinomials while part (d) is a binomial, yet they are all quadratic expressions. What makes each of them a quadratic? Justify your responses.

What is the highest power of the variable in each of the problems?