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128 = -12 + (n-1)4
128 + 12 = 4n - 4
140 + 4 = 4n
144 = 4n
144/4 = n
36=n
S36= 36/2 (2 x -12 + 35 x 4)
= 18 ( -24 + 140)
= 18 x 115
= 1370
b. U1=1
U2=4
U3=16
U4=64
U5= 64 x 4= 256
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