Jawabanmu

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2014-04-02T19:35:19+07:00
Sn=3n2 -4n
U1=S1=3(1)
² - 4(1)
          = 3 - 4
          = -1

S10 = n/2 (U1+U10)
3(10)² - 4(10) = 10/2 (-1+U10)
300 - 40 = 5 (-1+U10)
260 = -5 + 5U10
265 = 5U10
U10 = 265/5
U10 = 53
1 5 1