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Un =2n^2 - 5
Maka,
U4 = 2 x 4^2 - 5
U4 = 2 x 16 - 5
U4 = 32 - 5
U4 = 27
U5 = 2 x 5^2 - 5
U5 = 2 x 25 - 5
U5 = 50 - 5
U5 = 45
Jadi, U4 + U5 = 27 + 45 = 72
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