Precalculus: Mathematics for Calculus, 7th Edition

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

Chapter 11 - Section 11.5 - Rotation of Axes - 11.5 Exercises - Page 823: 29

Answer

Parabola

Work Step by Step

The discrimination of the equation is found by the expression $B^{2}-4AC$. It is a parabola if $B^{2}-4AC$ equals 0. An ellipse if $B^{2}-4AC$ is between 0 and 1. A hyperbola if $B^{2}-4AC$ is over 1. The equation in the form $Ax^{2}+Bxy+Cy^{2}+Dx+Ey+F=0$ tells us what values to input in the expression. In this problem, the constants $A$, $B$, $C$ are: $A=2$ $B=-4$ $C=2$ Calculate the discriminant: $B^{2}-4AC$ = $(-4)^2-4(2)(2)$ = $16-16$ = $0$, which shows that the equation will be a parabola (proven by graph above).
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