Question

Fie functia f:R->R , f(x)=3x+6
Rezolvati in multimea numerelor reale ecuatia 3·f(x)-f(1)=f(2)

Answer 1

f(x)=3x+6
3 f(x)-f(1)=f(2)
f(1)=3×1+6=3+6=9
f(2)=2×3+6=6+6=12
3×(3x+6)-6=12⇒
9x+18-6=12⇒
9x+12=12⇒9x=12-12⇒
9x=0
x=0/9⇒x=0
sucees