exam Maths Puzzle Numerical Ability

(Square root of)12xy *(times) (the cubed root of)9x2y * (the fourth Root of) 15x3y2 * (the 8th root of)24x5y7

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exam Other Question
-x^3(9-x^2)^(-1/2)+2x(9-x^2)^(1/2) how can I simplify the exponents when adding and the last exponents has got a whole number before it