Answer to Question #46761 in Algebra for Md A Rahman

Question #46761

1.Solve the equation 9x^4 -18x^3 -31x^2 + 8x +12=0 by Ferrari"s method.
2.Use De Moivre"s theorem to obtain the 6^th roots of i5-1.Also show that them in an Argand diagram.

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