exam Maths Puzzle Numerical Ability

OK I'm back with 2 questions here, I just had Surg. Monday so I'm really out of it but I tried to solve these none the less and I need some help please.

ymxm-y3xm
xxm2-y3xm
ym

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exam Other Question
How can you show a graph that approaches negative infinty as x approaches 3 from the left?

Thank you. please help to simplify :

(x^3 - 5x^2 - 24x / x^2 - 9) * (x^2 + 3x - 18 / x^3 - 11x^2 + 24x)

thank you!