Q. 185.0( 1 Vote )
The length of the latus - rectum of the parabola 4y2 + 2x – 20y + 17 = 0 is
A. 3
B. 6
C. 1/2
D. 9
Answer :
Given equation of the parabola is 4y2 + 2x - 20y + 17 = 0
⇒ 4y2 - 20y + 17 = - 2x
⇒ 
⇒ 
⇒ 
Comparing with standard form of parabola (y - a)2 = - 4b(x - c) we get,
⇒ 
We know that the that the length of the latus rectum is 4b.
∴The correct option is C
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