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a → 3
b → 6
c → 3
Un = a + (n - 1)b + 1/2(n - 1)(n - 2)c
Un = 3 + (n - 1)6 + 1/2(n - 1)(n - 2)3
Un = 3 + 6n - 6 + 1/2(n(n - 2) - 1(n - 2))3
Un = 6n - 3 + 1/2(n² - 2n - n + 2)3
Un = 6n - 3 + 3/2(n² - 3n + 2)
Un = 6n - 3 + 3/2n² - 9/2n + 3
Un = 6n - 9/2n + 3/2n²
Un = 12/2n - 9/2n + 3/2n²
Un = 3/2n + 3/2n²
Un = 3/2n² + 3/2n
Un = 3/2n(n + 1) / 3/2(n² + n)
semoga bermanfaat..........
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KUIS
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a → 3
b → 6
c → 3
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Un = a + (n - 1)b + 1/2(n - 1)(n - 2)c
Un = 3 + (n - 1)6 + 1/2(n - 1)(n - 2)3
Un = 3 + 6n - 6 + 1/2(n(n - 2) - 1(n - 2))3
Un = 6n - 3 + 1/2(n² - 2n - n + 2)3
Un = 6n - 3 + 3/2(n² - 3n + 2)
Un = 6n - 3 + 3/2n² - 9/2n + 3
Un = 6n - 9/2n + 3/2n²
Un = 12/2n - 9/2n + 3/2n²
Un = 3/2n + 3/2n²
Un = 3/2n² + 3/2n
Un = 3/2n(n + 1) / 3/2(n² + n)
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semoga bermanfaat..........