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Verified answer
Jawabannya, S10 = 165Verified answer
Materi : Barisan dan deretPembahasan :
U3 + U4 = 5
a + 2b + a + 3b = 5
2a + 5b = 5
U5 + U7 = 40
a + 4b + a + 6b = 40
2a + 10b = 40
a + 5b = 20
Eliminasi...
2a + 5b = 5
a + 5b = 20
——————— (-)
a = -15
Suku Pertama = -15
Substitusi...
a + 5b = 20
-15 + 5b = 20
5b = 35
b = 7
S10 = 10/2(2.-15 + 9.7)
S10 = 5(-30 + 63)
S10 = 165