Question

Tolong Ya Dengan Cara !!

Answer 1

Diketahui barisan aritmetika
U3 = -1
U5 = 3

Un = a + (n-1)b
dengan Un = suku ke-n
a = suku awal atau juga bisa disebut U1
b = beda

U3 = -1
a + (n-1)b = -1
a + (3-1)b = -1
a + 2b = -1
a = -1 - 2b

U5 = 3
a + (5-1)b = 3
a + 4b = 3, subsitusikan nilai a = -1 - 2b
-1 - 2b + 4b = 3
-1 + 2b = 3
2b = 3 + 1
2b = 4
b = 4/2
b = 2

a = -1 - 2b
a = -1 - 2 . (2)
a = -1 - 4
a = -5

U10 = a + (10-1)b
U10 = -5 + (9) 2
U10 = -5 + 18
U10 = 13

jawaban B.13