Question 414257
pool is 2x -1 meters, and the width is x +2 meters.

Area = L*W
Area = (2x-1)(x+2)
Area =2x^2+4x-x-2
A(x) =2x^2+3x-2 
...
A(5)= 2(5^2)+3(5)-2
A(5)=50+15-2
A(5)=63 m^2