exam Maths Puzzle Numerical Ability

square root of 15 + 8 square root of 15 - 12 square root of 15

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exam Other Question

Problem is:

x - x^2/3 = x^1/3 (??) Fill in the ??. The object is to find the equation that when multiplied by x^1/3 would give the result of x - x^2/3.

I know this has to be something simple, but my brain is fried. Show the difference between a four-digit number and its reverse is divisible by 9