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U11 = 43
Un = a + (n-1) b
U11 = 3 + (11-1) b
43 = 3 + 10b
10b = 43 -3
= 40
b = 4
Un = 3 + (n-1) 4
Un = 3 + 4n - 4
Un = 4n - 1
Rumus suku ke n : Un = 4n -1
U11 = 43
U11 = a + 10b = 43
3 + 10b = 43
10b = 40
b = 4
Ditanyakan: Un?
Penyelesaian:
Un = a + (n - 1)b
Un = 3 + (n - 1)4
Un = 3 - 4n - 4
Un = -1 - 4n
Ada yang salah silakan komentar mksh:)