Tentukan 5 suku pertama Dan pola barisan Un = 1/2 n² + 1/2

Un = 1/2 n^2 + 1/2

U1 = 1/2 (1)^2 + 1/2
U1 = 1/2 + 1/2
U1 = 2/2
U1 = 1

U2 = 1/2 (2)^2 + 1/2
U2 = 1/2 (4) + 1/2
U2 = 2 + 1/2
U2 = 2 1/2 atau 5/2

U3 = 1/2 (3)^2 + 1/2
U3 = 1/2 (9) + 1/2
U3 = 9/2 + 1/2
U3 = 10/2
U3 = 5

U4 = 1/2 (4)^2 + 1/2
U4 = 1/2 (16) + 1/2
U4 = 8 + 1/2
U4 = 8 1/2 atau 17/2

U5 = 1/2 (5)^2 + 1/2
U5 = 1/2 (25) + 1/2
U5 = 25/2 + 1/2
U5 = 26/2
U5 = 13

Semoga membantu.. ^_^