Ellipse 1 Question 6

7. If P=(x,y),F1=(3,0),F2=(3,0) and 16x2+25y2=400, then PF1+PF2 equals (1998,2M)

(a) 8

(b) 6

(c) 10

(d) 12

Objective Questions II (Only one or More than one)

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Answer:

Correct Answer: 7. (b)

Solution:

  1. Given, 16x2+25y2=400

[given]

x225+y216=1

Now, PF1+PF2= Major axis =2a

=2×5=10

[where, a=5 ]



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