exam Maths Puzzle Numerical Ability

i dont really understand this either really; x^2-9/x-2 * x^2-4/x-3
i think i solved it totally wrong since i first multiplied the top then the bottom and got x^4 - 13x^2 +36 / x^2 - x - 6.
could someone please show me how to solve it right?

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exam Other Question

1.Where do you use cramer's rule
2.Why would you want to use cramer's rule
3. The meaning of determinant
whats 21% as a degree out of 360%