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11/2 x (2(4) + (11-1) x -2)
5,5 x (8 + -20)
5,5 x -12
= -66
U7 = a + 6b=-8
substitusikan a=-2b ke persamaan U7 :
a+6b=-8
(-2b)+6b=-8
4b=-8
b=-8/4=-2
maka diperoleh a=-2b = -2(-2) =4
S11= (n/2)(2a+(11-1)b)
=(11/2)(2(4)+10(-2))
=(11/2)(8-20)
=(11/2)(-12)
=(11)(-6) = -66