book Maths Puzzle Numerical Ability

5x^-15x^3-25x-10 need to find out how to set this problem?

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book Other Question

Calculate the amount to be received at the end of year 1 that is equivalent to $150 at the end of year 1, $450 at the end of year 2, and $300 at the end of year 3, given a discount How do we solve (2u+4)(u+1)