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U₈ = -4 + 7 × 6
U₈ = 38
beda (b) = 2 - (-4) = 8 - 2 = 6
Un = a + ( n - 1 ) b
U₈ = -4 + ( 8 - 1 ) 6
U₈ = -4 + ( 7 x 6 )
U₈ = -4 + 42
U₈ = 38