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[" At "x" is "(1)/(1" friequation ")(1)/(" If the quadratie equations,"x^(2)+bx+c-0" and "bx^(2)+cx+1-0" have acommon root then prove that ")],[" etther "b+c+1=0" or "b^(2)+c^(2)+1-bc+b+c" ."]

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