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ajutatima va rog f(x)=2x-4

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 )
2x-4=0
2x=4
x=4÷2
x=2
f(2)=2×2-4=0
(x;y)-(2;0)