Question

C2.
Fie funcția f:R → R, f(x)= x + 2x. Calculaţi:
$(-20) + f(-10) + f(0) + f(10) + f(20).

Answer 1

Hei! :)

f:R → R

f(x)= x + 2x

• f(-20)= -20-4= -60;
• f(-10)= -10-20= -30;
• f(0)= 0;
• f(10)= 10+20= 30;
• f(20)= 20+40= 60

=> $f(-20) + f(-10) + f(0) + f(10) + f(20)=-60-30+0+30+60=0$