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May 11th, 2009, 04:26 PM   #1
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Quadratic Formula

Write the equation as a quadratic equation in y and use the quadratic formula to solve for y.
x^2-y^2-2x-4y-4=0
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May 12th, 2009, 05:41 AM   #2
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Quote:
Originally Posted by yoman360
Write the equation as a quadratic equation in y and use the quadratic formula to solve for y.
x^2-y^2-2x-4y-4=0
Where are you stuck in following the instructions?

You've rewritten the equation as 0 = y^2 + 4y + (4 + 2x - x^2) = 0 -- so a = 1, b = 4, and c = 4 + 2x - x^2 -- plugged "a", "b", and "c" into the Quadratic Formula, and... then what?

Please be complete. Thank you!
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May 12th, 2009, 07:16 AM   #3
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Re: Quadratic Formula

It looks like you were assigned to plot the hyperbola given by the equation. As stated by Stapel, use the quadratic formula to solve for y and you will get something like y = a +- (b)^2.
Then you can use your calculator to plot the hyperbola. Remember there will be two equations required since there is a +- b term.

I'll let you work the math.
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