BarberaMillikan279 BarberaMillikan279

15-04-2015
Mathematics

Answered

D33

What is the length of th emajor ais of the ellipse whose equation is 10x² + 20y² =200?

A3.16
B4.47
C6.32
D8.94
E14.14

Verified Answer :

crisforp crisforp

15-04-2015

10x² + 20y² =200 / ÷ 200 ;
x^2 / 20 + y^2 / 10 = 1 ;
x^2 / \(( \sqrt{20} )^{2}\) + y^2 / \(( \sqrt{10} )^{2}\) = 1 ;
b = \(\sqrt{20}\) ; a = \(\sqrt{10}\) ;
Major axis is 2a = 2\(\sqrt{10}\) ;

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