exam Maths Puzzle Numerical Ability

I know the answer, I cannot figure out how to get there. 3/x+2=?/x^3 + 8. I know that question mark is 3x^2 - 6x + 12, but how do I get there?

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exam Other Question
compute slope of line connecting (-2,3) and (3,1) ? add

x^2/x-5+
4x-45/x-5

Thank you