book Maths Puzzle Numerical Ability

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

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book Other Question

A triangle has the following three figures in regard to its sides, respectively:

3/4x, 1/x^2, 5/x^2

Find an expression that represents its perimeter.

Thanks! Determine whether the following pairs of lines are parallel, perpendicular or neither.

A) 2x + y = 1 and x-2y-1

b) 3x-y + 2= 0 and 3x + y = 0

C) y = 2x - 1 and 2x-y + 3=0