Question

f:R->R f(x)=x+3
Calculati S= f(-1) +f(1)+f(3)+...+f(55) Va rog sa ma ajutati​

Answer 1

Explicație pas cu pas:

f(x)=x+3

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

f(1)=1+3=4

f(3)=3+3=6

f(5)=5+3=8

.

.

.

f(55)=55+3=58

S=2+4+6+8+...+58=>

S=2(1+2+3+4+...+29)=>

S=2*29*30/2=>

S=29*30=>S=87*10=>S=870