exam Maths Puzzle Numerical Ability

(-2,1),1

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please i would like to give this question in words.i hope you would understand.(1)if x=cube root of a+b +a-b and a^2-b^2=r^3,then prove that x^3-3rx-2a=0,(2)given that log^(y-1)+lo break down and solve:

5x > 8 x 3/2