exam Maths Puzzle Numerical Ability

Find all the zeros of the function:
*x^3+3x^2-x+12

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exam Other Question

What is the domain and range of the following relation: r = (x + 2)/(x - 1)? Which is the best approximation of the solution of the equation:
-2.9n - 4.89 = 1.75(n + 14.5)?

A. -17.81 B. -6.51
C. -4.55 D. -4.41