February 16th, 2009, 01:23 PM  #1 
Member Joined: Feb 2009 Posts: 76 Thanks: 0  Quadratic surfaces
Reduce the equation to one of the standard forms, classify the surface and sketch it. 4x^2  9y^2 + z^2 + 36 = 0 so... my work> (4x^2  9y^2 + z^2 + 36 = 0) / 36 x^2 /9  y^2 / 4 + z^2 /36 = 1 x^2 /9 + y^2 / 4  z^2 /36 = 1 I am not sure what to classify this surface. I think its an hyperboloid of Two sheets. but I am not sure how to sketch this 
February 17th, 2009, 04:40 AM  #2 
Senior Member Joined: Dec 2008 Posts: 251 Thanks: 0  Re: Quadratic surfaces
I just tried sketching it. It might be easier to scale the and axes down a bit.


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