Use the Definition of Inverses to Determine Whether F and G

True/False

Use the definition of inverses to determine whether f and g are inverses.
- $$f ( x ) = 2 x ^ { 2 } + 1 , x \geq 0 ; \quad g ( x ) = \sqrt { \frac { x - 1 } { 2 } } , x \geq 1$$