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0 votes
1.1k views
in Analytical Geometry by (47.6k points)
closed by

ax2 + 4xy + 2y2 = 0 represents a pair of parallel lines then ‘a’ is: 

(a) 2 

(b) -2

(c) 4 

(d) -4

1 Answer

+1 vote
by (47.9k points)
selected by
 
Best answer

(a) 2

Here a = 0, h = 2, b = 2 

Condition for pair of parallel lines is b2 – ab = 0 

4 – a(2) = 0 

⇒ -2a = -4 

⇒ a = 2

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