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[" 2.If "ax^(2)+bx+c=0" has equal roots,...

[" 2.If "ax^(2)+bx+c=0" has equal roots,then "c=],[[" (a) "-(b)/(2a)," (b) "(b)/(2a)],[" (c) "-(b^(2))/(4a)," (d) "(b^(2))/(4a)]]

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