Is There a Mistake in the Hyperbolic Paraboloid Curve Demonstration?

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mohamed el teir
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upload_2015-10-23_6-12-27.png

then look at :
upload_2015-10-23_6-13-12.png

the 2 curves are nearly the same while the equations are not, is there anything wrong ?
 

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i just saw that it demonstrates c < 0, i understood now
 

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