Tentukan nilai y=x+13+x+23+x+33+…+x+1003!

Y=x+13+x+23+x+33+…+x+1003

mari kita pisahkan
13+23+33+…+1003
x+x+x+…+x
banyak x=n pola
Y=nx+sn

a=13
b=23-13=10

n=(Un-a+b)/b
n=(1003-13+10)/10
n=1000/10
n=100

S100
=n/2(a+Un)
=100/2(13+1003)
=50(1016)
=50800

Y=nx + S100
Y=100x + 50800