Find the difference in the volume and total area of a cylinder with both a radius and height of1 r-1, h-1

Although I am not clear as to whether the radius is r-1 or otherwise, but if i work with the values i see then:

Volume - T. S. A.

= πr²h - (2πr²+2πrh)

So after the simplification, I substitute the values given,

r = r-1 and h=h-1

And the answer is ...

π (r-1) (rh-3r-3h+5) !