exam Maths Puzzle Numerical Ability

x^3 - 4x^2 - 21x = 0

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exam Other Question

find the x intercept for -x2+7x-11
it is x square

and x intercept for -x2 -2x-1
this is also x square how do I solve: c^3+c^2-7c-3=0, given root -3?