Răspuns :
( x , x )
f ( x ) = 2x - 4
f ( x ) = x
2x - 4 = x
x = 4
f ( 4 ) = 2 × 4 - 4
f ( 4 ) = 4
( 4 , 4 )
f ( x ) = 2x - 4
f ( x ) = x
2x - 4 = x
x = 4
f ( 4 ) = 2 × 4 - 4
f ( 4 ) = 4
( 4 , 4 )