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Form a quadratic equation in the form ax2+bx+c=0 whose roots are b and twice the negative reciprocal of b.

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x=b   x=−1/b               
(x−b)(x + 1/b) =0
x2 + x/b − bx − 1=0         
x2 + (1/b − b)x −1 =0 

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