book Maths Puzzle Numerical Ability

Please help me solve this equation: (((x^3+x-1=0)))

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book Other Question

what is the function for all these number
-6,-5
-4,-4
-2,-3
0,-2
2,-1
4,0
6,1
8,2
they all have to have the same function evaluate the given functions:
1) x=0.98
2) x=3^1/2 / 8