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[" Given that the cubic "ax^(3)-ax^(2)+9...

[" Given that the cubic "ax^(3)-ax^(2)+9bx-b=0(a!=0)" has all three positive roots.Find the harmor "],[" of the roots independent of a and b,hence deduce that the root are all equal.Find also the minim "],[" of "(a+b)" if a and "b in N" ."]

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