book Maths Puzzle Numerical Ability

Solve the following inequalities:

a) x^3 < 8

b) x^3-x^2-9x+9 > 0

c) 2x^2-3x+1 / x+1 >0

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book Other Question

Please do you have a simple formula for finding the centre of a 2 dimensinal circle if I know 3 points on this circle? To find the difference between the pair of points(-3,0) and(4,0). What is the difference?