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Show that x=2 is a zero of 2x^(3)+x^(2)-...

Show that x=2 is a zero of `2x^(3)+x^(2)-7x-6`.

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If -1,2,alpha are the roots of the equation 2x^(3)+x^(2)-7x-6=0, then alpha is

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If A=[102021203], then show that A is a root of the polynomial f(x)=x^(3)-6x^(2)+7x+2