My Math Forum HELP ME!! Super confused @~@

 Pre-Calculus Pre-Calculus Math Forum

 August 26th, 2016, 07:26 AM #1 Member   Joined: Aug 2016 From: South Korea Posts: 54 Thanks: 0 HELP ME!! Super confused @~@ Given: 2. An ellipse has vertices (10,-4) and (6,-4), and covertices (-2,-9) and (-2,1). Find its standard equation and its foci. I graphed it first, but.. (???) https://scontent.xx.fbcdn.net/v/t34....d7&oe=57C350E4 Someone explain this to me~~ ㅠㅠ
 August 26th, 2016, 07:45 AM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 2,501 Thanks: 1372 well clearly there is an error here. The midpoint of the vertices and co-vertices should coincide. The midpoint of the major axis is (8,-4) The midpoint of the minor axis is (-2, -4) inspection also shows that the minor axis is longer than the major axis which is incorrect by definition. I'd double check your point values. Thanks from SlayedByMath
August 26th, 2016, 07:57 AM   #3
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 Originally Posted by romsek well clearly there is an error here. The midpoint of the vertices and co-vertices should coincide. The midpoint of the major axis is (8,-4) The midpoint of the minor axis is (-2, -4) inspection also shows that the minor axis is longer than the major axis which is incorrect by definition. I'd double check your point values.

Given: A hyperbola has vertices (1,9) and (13,9), and one of its foci is (2,9). Find its standard equation.

I graphed it and this is what I got..

Isn't foci supposed to be behind vertex? Is this an error too??

 August 26th, 2016, 08:45 AM #4 Senior Member     Joined: Sep 2015 From: USA Posts: 2,501 Thanks: 1372 yep, this makes no sense. the foci will be at (xwest, 9), (xeast,9) where xwest < 1, and xeast > 13 Thanks from SlayedByMath

 Tags confused, super

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