exam Maths Puzzle Numerical Ability

add

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

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exam Other Question

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? HOW MANY DIAGONALS CAN BE DRAWN FROM ONE VERTEX OF A REGULAR OCTAGON?