Question

Tentukan 7 suku pertama barisan aritmatika jika dketahui a=10 dan b=-5

Answer 1

10, 5, 0, -5, -10, -15, -20

Answer 2

Un = a+(n-1)b
U1 = 10+(1-1)(-5) = 10+0 = 10
U2 = 10+(2-1)(-5) = 10-5 = 5
U3 = 10+(3-1)(-5) = 10+(2)(-5) = 10-10 = 0
U4 = 10+(4-1)(-5) = 10+(3)(-5) = 10-15 = -5
U5 = 10+(5-1)(-5) = 10+(4)(-5) = 10-20 = -10
U6 = 10+(6-1)(-5) = 10+(5)(-5) = 10-25 = -15
U7 = 10+(7-1)(-5) = 10+(6)(-5) = 10-30 = -20
semoga dapat membantu