Given Function is
- f ( x ) = 7x - 7 ------- eqn ( 1 )
Now , put the value of x = 8 in eqn ( 1 )
- f ( 8 ) = 7 ( 8 ) - 7
- f ( 8 ) = 56 - 7
- f ( 8 ) = 49 ------- eqn ( 2 )
Now , put the value of x = 4 in eqn ( 1 )
- f ( 4 ) = 7 ( 4 ) - 7
- f ( 4 ) = 28 - 7
- f ( 4 ) = 21 ------- eqn ( 3 )
From eqn ( 2 ) nd eqn ( 3 ) we get,
- f ( 8 ) + f ( 4 )
- 49 + 21
- 70
Hope Helps! :)
