book Maths Puzzle Numerical Ability

mary is half as old as mark the sum of their ages is 51. How old are they no

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HI! I need help understanding the steps in solving this problem:

(X+2)^3-(X+2)^2-(X+2)+2

I know the answer is x^3+5x^2+7x+4 but I get lost in the steps. THANX! List all the factors of 36.