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b. U8 = U1 + (n-1)b = -10 + (7)-4 = -10 -28 = -38
b = -6
a = 4
4 + -6 (12 - 1)
4 -72 + 6
- 62
2. a=-10 b=6
un = -10 + 6 (8 - 1)
un = -10 + 48 - 6
u8 = 32