Pair Of Straight Lines Question 31

Question: The equation $ x^{2}+ky^{2}+4xy=0 $ represents two coincident lines, if k =

[MP PET 1995]

Options:

A) 0

B) 1

C) 4

D) 16

Show Answer

Answer:

Correct Answer: C

Solution:

To represent pair of coincident straight lines $ x^{2}+ky^{2}+4xy=0 $ must be perfect square. Therefore, $ k=4 $ .

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