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Verified answer
Barisan AritmatikaU3 = a + 2b = 9 ... (1)
U5 + U7 = 36
(a + 4b) + (a + 6b) = 36
2a + 10b = 36
a + 5b = 18 ... (2)
(2) - (1) = 18 - 9
(a + 5b) - (a + 2b) = 9
3b = 9
b = 3
a + 2b = 9
a = 9 - 2 . 3
a = 9 - 6
a = 3
Suku ke 9 = U9
U9 = a + 8b
U9 = 3 + 8.3
U9 = 3 + 24
U9 = 27