tentukan A dan B jika diketahui unsur-unsur pada barisan aritmetika dibawah ini ... a. U13 = 8 dan U17 = 48 b. U4 = 3 dan U6 - U1 = 5 c. U6 = -5 dan U10 - U2 =

a. U13 = 8 dan U17 = 48

U17 = a + 16b = 48
U13 = a + 12b = 8
-------------------------- -
4b = 40
b = 40/4
b = 10

a + 12b = 8
a + 12(10) = 8
a + 120 = 8
a = 8 - 120
a = -112

b. U4 = 3 dan U6 - U1 = 5

U4 = a + 3b = 3
U6 - U1 = a + 5b - a = 5
5b = 5
b = 5/5 = 1

a + 3b = 3
a + 3(1) = 3
a + 3 = 3
a = 3 - 3
a = 0

c. U6 = -5 dan U10 - U2 = -2

U6 = a + 5b = -5
U10 - U2 = a + 9b - a - b = -2
8b = -2
b = -2/8 = -1/4

a + 5b = -5
a + 5(-1/4) = -5
a - 5/4 = -5
a = 5/4 -5
a = 5/4 - 20/4
a = -15/4

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