book Maths Puzzle Numerical Ability

What would you do to simplify a quadratic expression such as 5x^3-27x^2+58x+56?

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book Other Question

How do I put {-8.4, -7.2, -6.0, -4.8} on a number line? Evaluate the expression: 3.2^-3/5.

I have come up with two different answers when I went my an checked my work.

Thanks so much for anyones help