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If b1. b2=2(c1+c2) then at least one of ...

If `b_1. b_2=2(c_1+c_2)` then at least one of the equation `x^2+b_1x+c_1=0 and x^2+b_2x+c_2=0` has a) imaginary roots b) real roots c) purely imaginary roots d) none of these

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