Jawabanmu

2014-03-06T15:36:25+07:00

a = 2x + 1
b = 2
S26 = 4275

S26 = 26/2 (2a + (n-1)b)
      = 26/2 (2.(2x+1) + (50-1)2)
      = 13 (4x + 2 +98)
     = 13 (4x + 100)
4275  = 52x + 1300
4275-1300 = 52x
2975 = 52x

x = 57,21

kalau (2x+50) kayanya ga ada.

Maaf...