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If the equations ax^2 + bx + c =0 and x^2 + 2x + 9 =0 have a common root then find a:b:c

+1 vote
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asked Sep 14, 2016 in Mathematics by Rahul Roy (7,955 points)

1 Answer

+1 vote
answered Sep 15, 2016 by Abhishek Kumar (14,688 points)
selected Sep 17, 2016 by Rahul Roy
 
Best answer

The roots of the equation x2 + 2x + 9 =0 are imaginary  as the discriminant D= 4-36= -32 , which is negative.

As the imaginary roots of a quadratic equation are conjugate to each other, so both the roots of the equations will be common.

So, a/1 = b/2 =c/9

or,  a:b:c = 1:2:9

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