exam Maths Puzzle Numerical Ability

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).

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exam Other Question

find the inverse function
f(x) = 9 - 10x^2 , x < 0
worksheet problem that i got very partial credit on.. please show/explan how to solve this...

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