## Introductory Algebra for College Students (7th Edition)

Published by Pearson

# Chapter 9 - Section 9.1 - Solving Quadratic Equations by the Square Root Property - Concept and Vocabulary Check: 4

#### Answer

$\sqrt {(x_2-x_1)^2+(y_2-y_1)^2}$

#### Work Step by Step

The distance formula uses the Pythagorean Theorem, since a line drawn between the two points is the hypotenuse of a right triangle whose legs are the horizontal and vertical distances between the points.

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