Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 1 - Section 1.9 - The Coordinate Plane; Graphs of Equations; Circles - 1.9 Exercises - Page 104: 102

Answer

The given equation represents a circle with: center at $(-\frac{1}{4}, -1)$ radius = 1 unit

Work Step by Step

RECALL: The standard form of the equation of a circle whose center is at (h, k) and radius $r$ is: $(x-h)^2+(y-k)^2=r^2$ If the given equation can be written in the form given above, then it must represent a circle. Rewrite the given equation by completing the square to have: $\\(x^2+\frac{1}{2}x)+(y^2+2y)=-\frac{1}{16} \\(x^2+\frac{1}{2}x+\frac{1}{16})+(y^2+2y+1)=-\frac{1}{16} + \frac{1}{16}+1 \\(x+\frac{1}{4})^2+(y+1)^2=1$ Thus, the given equation represents a circle with center at $(-\frac{1}{4}, 1)$ and a radius of $1$ unit.
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