Verify that the function satisfies the three hypotheses Rolle's Theorem on the given interval. Then find all numbers c that satisfy the conclusion of Rolle's Theorem.
5. f(x)-2x-4x+5. [1,3]
6. f(x)-x-2x-4x+2, (-2,2]
7. f(x) sin(x/2). [#/2, 3/2]
8. f(x) = x+1/x. [1.2]