exam Maths Puzzle Numerical Ability

I do not understand how to do this problem.

Swimming space. The length of a rectangular swimming pool is 2x – 1 meters, and the width is x + 2 meters. Write a polynomial that represents the area. Find the area if x is 5 meters.

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Hi Can I have some help with this function? Thanks

Evaluate the piecewise defined function at the indicated values.
f(x)={(-2x if x < -5, x + 4 if -5 <= x <= 2, (x - 2)^2 if 4x^21+4^22=4-10^n