Question

Sebuah barisa bilangan mempunyai pola barisan yang dirumuskan dengan Un=n²+3n. lima suku pertama nya adalah...

Answer 1

Verified answer

Un = n^2 + 3n
n = 1

= 1^2 + 3(1)
= 4

n = 2
= 2^2 + 3(2)
= 4 + 6
= 10

n = 3
= 3^2 + 3(3)
= 9 + 9
= 18

n = 4
= 4^2 + 3(4)
= 16 + 12
= 28

n = 5
= 5^2 + 3(5)
= 25 + 15
= 40

Jadi suku lima berturut turut: 4, 10, 18, 28, 40