Materi : Barisan dan Geometri
Pola barisan bertingkat
10, 12, 16, 22, ... [ a = 10 ]
+2, +4, +6, ... [ b = 2 ]
+2, +2, ... [ c = 2 ]
Maka rumus pola :
Un = a + b( n - 1 ) + c/2( n - 1 )( n - 2 )
Un = 10 + 2( n - 1 ) + 2/2( n² - 3n + 2 )
Un = 10 + 2n - 2 + n² - 3n + 2
Un = n² - n + 10
Semoga bisa membantu
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Materi : Barisan dan Geometri
Pola barisan bertingkat
10, 12, 16, 22, ... [ a = 10 ]
+2, +4, +6, ... [ b = 2 ]
+2, +2, ... [ c = 2 ]
Maka rumus pola :
Un = a + b( n - 1 ) + c/2( n - 1 )( n - 2 )
Un = 10 + 2( n - 1 ) + 2/2( n² - 3n + 2 )
Un = 10 + 2n - 2 + n² - 3n + 2
Un = n² - n + 10
Semoga bisa membantu