Question

One to one functions g and h are defined as follows.

Answer 1

1. g^-1 ( - 1 ) = 6

2. h^-1 ( x ) = ?
y = 2 x - 9
- 2 x = - y - 9   / : ( -2 )
x = ( y + 9 )/ 2
h^-1 ( x ) = ( x + 9 ) / 2 

3. ( h ° h^-1) ( 1 ) = ?
h ( h^-1 ( 1 ) )= h ( (1+9) /2 ) = h ( 5  ) = 2· 5 - 9 = 10 - 9 = 1