write the equation of the ellipse in standard form?

Mathematics
Tutor: None Selected Time limit: 1 Day

can you explain how I can transfer I to standard form like all the steps.

1. 7x^2+3y^2=84

2. 4x^2+9y^2+24x-90y=-225

3. 9x^2+16y^2-54x+64y+1=0

Jan 15th, 2015

1.

x^2/12 + y^2/28 =1

For others i can do it but need some time 

Jan 15th, 2015

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Jan 15th, 2015
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Jan 15th, 2015
Dec 3rd, 2016
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