Question

Tentukan rumus pola tingkat 2 dari barisan 2,4,8,14 ....

Answer 1

Verified answer

Barisan Aritmatika Bertingkat

a............2......4.......8.......14
b................2.......4.......6..........
c.....................2.......2........

a = suku pertama = 2
b = beda = 2
c = konstanta = 2

•
2A = c
2A = 2 ---> A = 1

•
3A + B = b
3.1 + B = 2 ---> b = -1

•
A + B + C = a
1 + (-1) + C = 2 ---> C = 2

Un = An² + Bn + C
Un = n² - n + 2

Pola utk barisan 2, 4, 8, 14, .... :
Un = n² - n + 2