book Maths Puzzle Numerical Ability

I need help on the question Identify all zeros of the polynomials function f(x)= {{{x^3-4x^2-2x=20}}}

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the perimeter of a triangle is 76cm. side A of the triangle istwo times the length of side B. side C is one cm more than side A. what is the lengths of the sides? problem 1; let T belongs to L(V) such that T not equal to I,T not equal to 0,T not equal to -I but T^2=T.please help me in finding the minimal polynomial of T.