NCERT Class XI Mathematics - Conic Sections - Solutions

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Question : 47
Total: 71
Major axis on the x-axis and passes through the points (4, 3) and (6, 2).
Solution:  
Since the major axis is along the x-axis.
∴ The equation of ellipse in standard form is
x2
a2
+
y2
b2
= 1
Since the ellipse passes through point (4, 3)
∴
16
a2
+
9
b2
= 1 ... (i)
Also, the ellipse passes through point (6, 2)
∴
36
a2
+
4
b2
= 1 ... (ii)
Solving (i) and (ii), we get a2 = 52 and b2 = 13
Hence the required equation of ellipse is
x2
52
+
y2
13
= 1.
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