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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book Other Question
Please help me to find the slope of the line passing through the points (10,-4) and (2,-4).

Thanks for your assistance,

JRR 3a2 -a +3 =0