College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 1, Equations and Graphs - Section 1.2 - Graphs of Equations in Two Variables; Circles - 1.2 Exercises - Page 103: 90


The equation represents a circle $ (x+\frac{1}{4})^2+(y^2+1)^2=1^2$ with center $(-\frac{1}{4},-1)$ and radius is $1$

Work Step by Step

$\underline{\textbf{Given equation}}$ $x^2+y^2+\frac{1}{2}x+2y+\frac{1}{16}=0$ $\Rightarrow x^2+\frac{1}{2}x+y^2+2y=-\frac{1}{16}$ $\Rightarrow (x^2+\frac{1}{2}x+\frac{1}{16})+(y^2+2y+1)=-\frac{1}{16}+1+\frac{1}{16}$ $\Rightarrow (x^2+\frac{1}{2}x+\frac{1}{16})+(y^2+2y+1)=1$ $\Rightarrow (x+\frac{1}{4})^2+(y^2+1)^2=1^2$ Which is the standard form for the equation of circle with center $(-\frac{1}{4},-1)$ and radius is $1$
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