book Maths Puzzle Numerical Ability

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

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book Other Question

What would you do to simplify a quadratic expression such as 5x^3-27x^2+58x+56? for quadratic functions, sketch two parabolas showing all procedure (concavity, y-intercept, x-intercepts, symmetric axis and vertex point)
A. y=2x^2-3x+1

B. y- -3x^2+2x+1