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Given the ellipse 8x^2 + y^2 + 80x - 6y + 193 = 0 find: a) The Center C
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High School Teacher
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To find the center of an ellipse, it needs to be put into standard form. This means that you need complete the square for both the x and y coordinates.
`8x^2+y^2+80x-6y+193=0` collect terms for x and y
`8x^2+80x+y^2-6y+193=0` factor 8 from x terms
`8(x^2+10x)+y^2-6y+193=0` add and subtract to complete the square
`8(x^2+10x+25-25)+y^2-6y+9-9+193=0` arrange perfect squares
`8(x+5)^2-8(25)+(y-3)^2-9+193=0` collect constants
`8(x+5)^2+(y-3)^2=16` divide by 16
The centre of the ellipse is at (-5,3).
Posted by lfryerda on July 16, 2013 at 11:41 PM (Answer #1)
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