Un = a + ( n - 1 )b
U4 = a + ( 4 - 1 )b = 12
U4 = a + 3b = 12
U10 = a + ( 10 - 1 )b = 14
U10 = a + 9b = 14
a + 9b = 14
a + 3b = 12
_________-
6b = 2
b = 2/6
b = 1/3
a + 3( 1/3 ) = 12
a + 1 = 12
a = 11
Jawaban:
a itu suku pertama ya, soalnya di deret aritmatika suku pertama disimbolkan dgn huruf a.
Penjelasan dengan langkah-langkah:
kalo ada yg mau ditanyakan tanya aja gpp^^
semoga paham
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Un = a + ( n - 1 )b
U4 = a + ( 4 - 1 )b = 12
U4 = a + 3b = 12
Un = a + ( n - 1 )b
U10 = a + ( 10 - 1 )b = 14
U10 = a + 9b = 14
a + 9b = 14
a + 3b = 12
_________-
6b = 2
b = 2/6
b = 1/3
a + 3b = 12
a + 3( 1/3 ) = 12
a + 1 = 12
a = 11
Jawaban:
a itu suku pertama ya, soalnya di deret aritmatika suku pertama disimbolkan dgn huruf a.
Penjelasan dengan langkah-langkah:
kalo ada yg mau ditanyakan tanya aja gpp^^
semoga paham