exam Maths Puzzle Numerical Ability

Find a rational zero of the polynomial function and use it to find all the zeros of the function.

f(x) = x to the third power + 4x to the second - x - 4

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please help me with this algebra problem (use linear combinations to solve the system of linear equations)x-y=0 -3x-y=2 Could I please have some help solving this problem. Thank you. x varies directly with y and inversely with z. x=0.25 when y=10 and z=20. find x when y=20 and z=10. Thank you...