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
Senior Member

Joined: Mar 2009

Posts: 318
Thanks: 0

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?

 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.

 Thread Tools Display Modes Linear 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

 Contact - Home - Forums - Cryptocurrency Forum - Top