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WebGraphing.com Forum » List all forums » Forum: Precalculus and Trigonometry Homework Help » Thread: elipses ? 
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syed786

find the center, foci, vertices, and eccentricity of the elipse 16). 9x^2+4y^236x+8y+31=0 find the equation of an elipse with its center at the origin. 30.) foci: (2,0) (2,0); major axis of length 8 find the equation of the elipse: 42) center: (3,2) ; a=3c; foci:(1,2) (5,2) for number 30 i got x^2/16 + y^2/12=1 for number 42 i got (x3)^2/36 + (y2)^2/32 = 1 i cant find the answer for 16...please help! 


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