Rumus suku ke-n dari barisan bilangan : 70, 65, 60, 55 adalah….
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Penjelasan dengan langkah-langkah:
Un = a + (n-1) b
Un = 70 + (n-1)-5
Un = 70 + -5n + 5
Un = 75 + -5n
Un = 75 - 5n
SOAL 1
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Rumus :
Un = a + (n - 1)b
a → 70
b → 65 - 70 → -5
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Un = 70 + (n - 1)(-5)
Un = 70 + (-5 × n)(-5 × -1)
Un = 70 + (-5n) + 5
Un = 70 - 5n + 5
Un = 75 - 5n
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