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[" Q29."Delta=|[a,b,ax+b],[b,c,bx+c],[ax...

[" Q29."Delta=|[a,b,ax+b],[b,c,bx+c],[ax+b,bx+c,0]|=0" if "],[" choose the answer: "],[[a,b,c" all in "A" .P "],[a,b,c" are in G.P "],[a,b,c" are in "HP]],[" In root of "ax^(2)+bx+c=0]

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