Show that the graph of an equation of the form Ax 2 + Cy 2 + Dx

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Show that the graph of an equation of the form 

Ax2 + Cy2 + Dx + Ey + F =0 A ≠0, C ≠ 0

where A and C are of the same sign.

(a) Is and ellipse if  D2/4A + E2/4C - F is the same sign as A. 

(b) Is a point if D2/4A + E2/4C - F = 0.

(c) Contains no points if D2/4A + E2/4C - F  is of opposite sign to A. 


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Precalculus

ISBN: 978-0321716835

9th edition

Authors: Michael Sullivan

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