exam Maths Puzzle Numerical Ability

Express in simplest form with rationalized denominators: a sqrt 2x^3 + sqrt 8a^2x^3

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exam Other Question

Mike invested $6000 for one year. He invested part of it at 9% and the rest at 11%. At the end of the year he earned $624 in interest. How much did he invest at each rate? Find all of the zeros of the polynomial function and state the multiplicity of each.
f (x) = (x^2� 9)^2