Question

Avem functia f:R->R f(x)= -3x+7

Calculaţi suma S=f(1)+f(2)+....+f(37)

Repede va rog mult! <3

Answer 1

S= -3(1+2+...+37) +7*37
= -3$\frac{37*38}{2}$ +259 =-2109+259 =-1850