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if it is known that z=−5z=−5 is one of the roots of f(z)=z4+6z3+13z2−20z−300f(z)=z4+6z3+13z2−20z−300 , find all...

if it is known that z=−5z=−5 is one of the roots of f(z)=z4+6z3+13z2−20z−300f(z)=z4+6z3+13z2−20z−300 , find all the roots of f(z)f(z).

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