exam Maths Puzzle Numerical Ability

how do I solve: c^3+c^2-7c-3=0, given root -3?

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exam Other Question

x^3 - 4x^2 - 21x = 0 Consider two events, A and B; if the presence of A excludes the possibility of B,
then P(A&B) = what and why?
a. 0, because the events are mutually exclusive
b. -1, because the