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[" 78.If "x^(2)+x+1" is a factor of "ax^...

[" 78.If "x^(2)+x+1" is a factor of "ax^(3)+bx^(2)+cx+d" ,"],[" then the real root of "ax^(3)+bx^(2)+cx+d=0" is "],[[" (1) "-(d)/(a)," (2) "(d)/(a)]]

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