Table of contents

3. Functions

Intro to Functions & Their Graphs

3. Functions

Intro to Functions & Their Graphs: Videos & Practice Problems

213PRACTICE PROBLEM

For the following circle equation, complete the squares in order to write the whole equation in standard form. Identify the center and radius, and then graph.
x² + y² - 4x + 18y + 21 = 0

ANSWERS OPTIONS

Standard Form: (x - 2)² + (y + 9)² = 64; Center = (2, - 9); Radius, r = 8; Graph:

Graph of a circle with center at (2, -9) and radius 8, in the context of college algebra.

Standard Form: (x - 2)² + (y + 9)² = 64; Center = (2, - 9); Radius, r = 16; Graph:

Graph of a circle with center at (2, -9) and radius 16, in the context of college algebra.

Standard Form: (x + 2)² + (y - 9)² = 64; Center = (2, - 9); Radius, r = 8; Graph:

Graph of a circle with center at (2, -9) and radius 8, in the context of college algebra.

Standard Form: (x + 2)² + (y - 9)² = 64; Center = (2, - 9); Radius, r = 16; Graph:

Graph of a circle with center at (2, -9) and radius 16, in the context of college algebra.