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if lambda x^2+10xy+3y^2-15x-21y+18=0 rep...

if `lambda x^2+10xy+3y^2-15x-21y+18=0` represents a pair of straight lines. Then , the value of `lambda` is

A

-3

B

3

C

4

D

-4

Text Solution

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The correct Answer is:
B
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