exam Maths Puzzle Numerical Ability

Determine all rational zeros.

P(x)= 4x^3 + 15x + 36

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exam Other Question

Find the values of each of the following plynomials of the given values of the variable:
-x^2-5x-6, x = -3 and x = -2

I am not getting this problem and a bit confused on how to solve this,and need some help. Thanks. 2m +2m