NCERT Class XI Mathematics - Conic Sections - Solutions

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Question : 46
Total: 71
Centre at (0, 0), major axis on the y-axis and passes through the points (3, 2) and (1, 6)
Solution:  
Since the major axis is along y-axis.
∴ The equation of ellipse in standard form is
x2
a2
+
y2
b2
= 1
Since the ellipse passes through the point (3, 2)
∴
9
b2
+
4
a2
= 1 ... (i)
Also, the ellipse passes through point (1, 6)
∴
1
b2
+
36
a2
= 1 ... (ii)
Solving (i) and (ii), we get a2 = 40 and b2 = 10
Hence the required equation of ellipse is
x2
10
+
y2
40
= 1.
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