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[" Prove that if "2a(0)^(2)<15" a,then a...

[" Prove that if "2a_(0)^(2)<15" a,then all roots of "],[x^(5)-a_(0)x^(4)+3ax^(3)+bx^(2)+cx+d=0" can't be real."],[" given that "a_(0),a,b,c,d in R]

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