exam Maths Puzzle Numerical Ability

Help Please

given f(x)=15x^3-4x^2+3x-8, find all possible rational zeros

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exam Other Question

If you could, please help me with this problem.
thanks

2
-------- +2
x + 4
------------------------
3
------- + 1
(x + 4) 2radical3 * 5radical27

how do you do a radical sign?