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Q.

The equation of the ellipse with its centre at (1,2), focus at (6,2) and passing through the point (4, 6) is

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a

(x−1)245+(y−2)220=1

b

(x−1)220+(y−2)245=1

c

(x−1)225+(y−2)216=1

d

(x−1)216+(y−2)225=1

answer is A.

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Detailed Solution

Centre of the ellipse is C(1,2). Also focus is at 5(6,2) Since axis is parallel to x-axis, equation of ellipse is(x−1)2a2+(y−2)2b2=1 It passes through (4,6)∴ 9a2+16b2=1 Also     ae=5⇒    b2=a21−e2⇒    b2=a2−a2e2⇒    b2=a2−25∴    9a2+16a2−25=1∴    a2−5a2−45=0∴    a2=45 as if a2=5,b2=−20∴    b2=20
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