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Grade 11Algebra

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

Profile image of Nandish Panchal
7 Years agoGrade 11
Answers icon

1 Answer

Profile image of Arun
7 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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