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f(x)= -5x + 11
rezolvati ecuatia: f(x+1) - 2f(x) = f(x-2) + 3


Răspuns :

f(x+1)= -5(x+1)+11= -5x-5+11= -5x+6

f(x-2)= -5(x-2)+11= -5x+10+11= -5x+21



f(x+1)-2f(x)=f(x-2)+3

-5x+6 -2(-5x+11)= -5x+21 +3

-5x+6+10x-22= -5x+24

5x-16= -5x+24

5x+5x=24 +16

10x= 40

x= 40/10

x= 4