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bab : barisan & deret
diketahui barisan :
-4, -1, 4, 11, 20
suku pertama ( a ) = -4
beda ( b ) : U2 - U1 = -1 - (-4) = 3
ditanya : rumua suku ke-n
Un = a + ( n - 1 )b
Un = -4 + ( n - 1 )(3)
Un = -4 + 3n - 3
Un = 3n - 7
jadi rumusnya : 3n - 7
#semoga membantu