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If the equations x^2+ ax + b =0 and x^2 + bx +a =0 have exactly one common root, then numerical value of a+ b is

6 years ago

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Dear sudha ,


let common root be k


K^2 + ka +b =0


K^2 + kb +a =0


subtract the equations


k = 1     putting this value


1 +a+b =0   i.e  a+b =-1


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6 years ago

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