Question

Se considera functia f:R-->R , f(x)=2x+3 .
a)Aratati ca f(x-1)+2 f(x+2)=3f(x+1) , oricare ar fi x apartine R .

Answer 1

2(x-1)+3+ 2*[2*(x+2)+3]=3[2*(x+1)+3] desfaci parantezele si dai totul intr-o parte ,apoi afli x