Question

Tentukan nilai x , jika (2x+1)+(2x+2)+(2x+3)+...+(2x+50) = 4.275

Answer 1

A = 2x + 1
b = 1
S50=4.275
50/2(2a+ (50-1).1)=4275
25(2a+49)=4275
50a+1225=4275
50a= 4275-1225=3050
a=3050/50=61
a= 2x+1 = 61
2x = 61-1=60
x = 60/2=30