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b (beda) = U2 - U1 = (2x + 2)-(2x+1) = 1
U50 = (2x + 50)
S50 = 4.275
Sn = n/2 (a+Un)
S50 = 50/2 (2x+1+2x+50)
4275= 25 (4x + 51)
4275/25 = 4x + 51
171 = 4x + 51
4x = 171 - 51
4x = 120
x = 120/4
x = 30
smg membantu... :)
caranya : 1 + 2 + 3 + 4 + ... + 50 = 1275
4275 - 175 = 3000
berikutnya bagilah 3000 dan 2 dan 50
3000 : 2 = 1500 : 50 = 30
jadi x = 30