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October 21, 2014

October 21, 2014

Posted by **joey** on Thursday, February 9, 2012 at 9:40pm.

- analytic geometry -
**Reiny**, Thursday, February 9, 2012 at 11:15pmlet's complete the square ...

4x^2 + 56x - (y^2 - 2y ) = -195

4(x^2 + 14x +**49**) - (y^2 - 2y +**1**) = -195 + 4(49) - 1

4(x+7)^2 - (y-1)^2 = 0

ahh, we have a degenerated hyperbola

the hyperbola has degenerated into its asymtotes

notice we have a difference of squares = 0

so

2(x+7) + (y-1) = 0 or 2(x+7) - (y-1) = 0

2x + 14 + y - 1 = 0 or 2x + 14 - y + 1 = 0

2x + y = -13 or 2x - y = -15

the "centre" would be the intersection of the two lines.

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