1.

If a and b positive numbers (altb), then the range of values of k for which a real lambda be found such that equation ax^2+2lambdaxy+by^2+2k(x+y+1)=0 represent a pair of straight lines is

Answer»

`altk^2ltb`
`alek^2leb`
`k^2lea or k^2geb`
`kle2a or kge2b`

ANSWER :D


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