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selisih = b = -9 - (-4) = -5
Un = a +(n-1)b
U8 = -4 + (8-1)-5
U8 = -4 + (7 x -5)
U8 = -4 + -35
U8 = -39
b = -9 - (-4) = - 5
Ditanya : U₈ = ?
Un = a + (n - 1)b
U₈ = -4 + (8 - 1)(-5)
= -4 + (7)(-5)
= -4 + (-35)
= -39