book Maths Puzzle Numerical Ability

Find the value of the following polynomial for the given values of the variable.

Value #1: x = -3
Value #2: x = -2

-x^2 - 5x -6 ?

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just 2 questions that are linked

if log(base 2)5 = x find an expression for...
1. log (base 2)20 = ??
2. log (base 2)[(cube root 5)/2]=??

if u could answer these that would be a huge help thx how is real numbers different from irrational numbers