Need help bad. Solver for the indicated variable. A = 2(pie)(r)^2 + 2(pie)(r)(h) solve for positive r. ?

Question

Please show all steps clearly.

Answer 1

A = (2)(π)(r^2) + (2)(π)(r)(h)

factor out 2π from the right side

A = 2π(r^2 + rh)

divide by 2π

A / 2π = r^2 + rh

0 =  r^2 + hr - A/(2π)

This is the standard quadratic equation.

Use the quadratic formula now.