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If x2+3x+3=0 and ax2+bx+1=0 ,(a,b belong to rational) have a common root, then value of (3a+b) is equal to :(A) 1/3(B) 1(C) 2(D) 4

Nandish Panchal , 6 Years ago
Grade 11
anser 1 Answers
Arun

Last Activity: 6 Years ago

1st equation has D 0
hence it has both roots imaginary 
Hence both equations have oth roots common
so
1/a = 3/b =3/1
a = 1/3
b = 1
hence
a/b = 1/3

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