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please solve the problem

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the equation of an ellipse is given. find the coordinates of the center and state whether the major axis is vertical or horizontal. x^2/5 + y^2/20 = 1
(x-4)^2/42 + (y+6)^2/23 = 1
asked Mar 17, 2014 in ALGEBRA 2 by futai Scholar

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The two equations of ellipse are x^2/5 + y^2/20 = 1 and (x - 4)^2/42 + (y + 6)^2/23 = 1.

The standard form of the equation of an ellipse center (h, k) with major and minor axes of lengths 2a and 2b (where 0 < b < a) is (x - h)^2/a^2 + (y - k)^2/b^2 = 1 or (x - h)^2/b^2 + (y - k)^2/a^2 = 1.

Compare the equation (x - 0)^2/(5)^2 + (y - 0)^2/(20)^2 = 1 with (x - h)^2/b^2 + (y - k)^2/a^2 = 1.

Center = (h, k ) = (0, 0), b = 5 and a = 20.

The major axes of lengths 2a = 220 = 45

The minor axes of lengths 2b = 25.

Compare the equation (x - 4)^2/(√42)^2 + (y + 6)^2/(23)^2 = 1 with (x - h)^2/a^2 + (y - k)^2/b^2 = 1.

Center = (h, k ) = (4, - 6), a =42 and b = 23.

The major axes of lengths 2a = 242.

The minor axes of lengths 2b = 223.

 

answered Mar 27, 2014 by steve Scholar
selected May 22, 2014 by futai

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