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 Algebra Pre-Algebra and Basic Algebra Math Forum

 May 11th, 2009, 04:26 PM #1 Newbie   Joined: Apr 2009 Posts: 5 Thanks: 0 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 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!  May 12th, 2009, 07:16 AM #3 Newbie   Joined: Nov 2008 Posts: 9 Thanks: 0 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. Tags formula, quadratic Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post mathkid Algebra 15 September 30th, 2012 10:01 PM Danicus Algebra 8 March 27th, 2012 10:06 AM confused20 Algebra 3 March 10th, 2008 04:34 PM Sean Algebra 1 December 28th, 2006 03:39 PM mathkid Calculus 0 December 31st, 1969 04:00 PM

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