exam Maths Puzzle Numerical Ability

worksheet problem that i got very partial credit on.. please show/explan how to solve this...

(4k/k^2-9) + (2/3-k)

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exam Other Question

I need help with this: use synthetic division to find the function value. g(x)=x^6+5x^5+9x^3-3x^2-23, g(-4). I have a few questions like these in my college algebra book with no examples to help.

10-13/x=4+5/x

and

x/(x+4) + 4/(x+4) + 2= 0