Question

cum ezolv ecuatia: (x + 1) + (x + 2) + ...(x + 41)= 40x + 860

Answer 1

(x+1)+(x+2)+...+(x+40)=40x+860
x+1+x+2+...+x+40=40x+860
41x+$\frac{40*41}{2}$=40x+860
41x+820=40x+860
41x-40x=860-820
x=40