exam Maths Puzzle Numerical Ability

Please help with my last two problems out of the 25 I had to do Thank you so much.

x^3 -4=2 show all work

show steps that you would take to solve the following
4-x over x-

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exam Other Question
Solve.

3 - a-1/a+2 = a^2-1/a+2 Let f(x)=x^3-8x^2+17x-9. Use the factor theorem to find other solution to f(x)-f(1)=0, besides x=1. my answer is 2,5 is that riht. thanks for checking for me.