A rectangle has a height of x+9 and a width of x^2+2x.

Express the area of the entire rectangle.

The area of the entire rectangle is given by: x^3 + 11x^2 + 18x

Step-by-step explanation:

The calculation of its area is straightforward, we only need to multiply its height times its width:

A = (x + 9) (x^2 + 2x) = x^3 + 2x^2 + 9x^2 + 18x = x^3 + 11x^2 + 18x

Therefore the are are of the entire rectangle is given by: x^3 + 11x^2 + 18x