book Maths Puzzle Numerical Ability

Can you show me how to solve this equation for X?

A = x^2(B + Cx)

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book Other Question

How much money should be invested in an annual interest rate of 8% in order to earn $250 of yearly interest?

Thanks you very much Writ each expression in exponential from.

1) x.x.y.y.y
2) a.b.b.a.a.a
3) x.(-x).y.y.y