exam Maths Puzzle Numerical Ability

Please help with the following. Last one i promise. thanks in advance

Find all solutions of the equation.

9x^3 - 24x^3 + 16x^2 = 0

thanks

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exam Other Question

A record rotates 100 times in 3 minutes. If side A plays for 22 minutes and 30 seconds, how many times will it rotate? Please help!

Evaluate

a - absolute vale of b*a^2 - ba