How Do You Calculate the Distance Between Vertices of a Hyperbola?

[muddyjch]

Homework Statement

Determine the distance D between the vertices of -9x^2+18x+4y^2+24y-9=0

Homework Equations

The Attempt at a Solution

This is an online problem that my calc2 instructor gave us. I can't find anything in my book of this level of difficulty. Any help would be appreciated.

 

[tiny-tim]

hi muddyjch!

(try using the X² icon just above the Reply box )

have you tried to complete the square to find the centre of the hyperbola?