book Maths Puzzle Numerical Ability

Dear Sir/Madam,
I am confronted with the following problem:
"Suppose $31,000 is deposited in a savings account that has an interest rate of 5.7% per year and the interest is co

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I am not sure how to solve this problem when there is a x^3

x^3 + y = 0
x^2 - y + 0 My son is having a problem solving the following equation.
m^3-5m=2m^2-3

I'm not sure how to handle the exponents so I get lost solving this with him. You're help is appreciate