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[" If "alpha,beta" are roots of the equation "ax^(2)-bx-c=0," then "alpha^(2)-alpha beta+beta^(2)" is equal to- "],[[" (A) "(b^(2)+3ac)/(a^(2))," (B) "(b^(2)-3ac)/(a^(2))," (C) "(b^(2)+2ac)/(a^(2))," (D) "(b^(2)-2ac)/(a^(2))]]

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