In this chapter, you will begin to build your skill at working with quadratic expressions. You have already used area models to represent the area of a rectangle as a product and as a sum. In Section 4.1, you will learn how to change a quadratic expression written as a sum into its product form. This skill will be useful when you graph quadratic functions in Chapter 5.
In Chapter 3 you explored the tangent ratio, which is a powerful tool that allows you to calculate missing side lengths and missing angle measures in right triangles. In Section 4.2, you will learn two new trigonometric ratios and then apply trigonometry to solve problems.
In Chapter 3 you explored the tangent ratio, which is a powerful tool that allows you to calculate missing side lengths and missing angle measures in right triangles. In Section 4.2, you will learn two new trigonometric ratios and then apply trigonometry to solve problems.