tycon69 Posted December 18, 2007 Share Posted December 18, 2007 So i had a trig test today, and my teacher marked off a problem, and ive reviewed it plenty of times, but cant seem to figure out what i did wrong. Could someone please help me with this, i am simply converting to standard form of an ellipse/hyperbola. The equation is x^2 + 4y^2 +2x +16y = -1 . I believe that my answer was something like ((x+1)^2)/4 + ((y+2)^2)/1 = 1 . I am not possitive if that was my exact answer, but i am sure the problem is exact. I think i got it right and just neglected to show some valuable piece of work, and my strict math teacher counted it off. Thx in advance for the help, and i appologize for not using latex, i was in a hurry. Link to comment Share on other sites More sharing options...
CPL.Luke Posted December 18, 2007 Share Posted December 18, 2007 when you completed the squares you neglected to properly add the (b/2)^2 terms to the rhs of the equation it should be equal to 4 Link to comment Share on other sites More sharing options...
Country Boy Posted December 18, 2007 Share Posted December 18, 2007 No, you did hnot get it right! I think your error was that when you "completed the square" for the y terms you added "4" on the right hand side but forgot that it should be multiplied by the 4 multiplying (x+1)^2. You should have had 16 on the right hand side, not 4, and then, dividing the entire equation by 16, (x+1)^2/16+ (y+2)^2/4= 1. By the way, why did you title this "standard form for a circle"? Link to comment Share on other sites More sharing options...
tycon69 Posted December 18, 2007 Author Share Posted December 18, 2007 thx for the reply, turns out i had it right on my paper, when i tried to remember what i put, i did it mentally and for got to multiply the 4, but i had it right on the test, just forgot to show how i found my c value to graph it, but thanks for the help anyways. I titled it "standard form for a circle because thats what i was trying to find and i was in a hurry lol. Link to comment Share on other sites More sharing options...
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