exam Maths Puzzle Numerical Ability

find the inverse function
f(x) = 9 - 10x^2 , x < 0

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exam Other Question

(2y),(3,3),m=2 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).