what are the roots of
i) f(x)=X^4-6x^3+10x^2+2x-15
ii) f(x)=x^3+11x^2+ 31x+21

what are the roots of
i) f(x)=X^4-6x^3+10x^2+2x-15
ii) f(x)=x^3+11x^2+ 31x+21

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try synthetic division

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