We are given the expression S = 2πr^2 + 2πrh and is asked to solve for h. This is the formula of the surface area of a cylinder. In this case,

S - 2πr^2 = 2πr h dividing the whole equation by 2πr, thenh = (S - 2πr^2) / 2πrh = S/2πr - r

**Answer:**

**Step-by-step explanation:**

√2x(7 + √2x)

7√2x + √2x ·√2x

7√2x + 2x

or

2x + 7√2x

A is the answer