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U4 = 2(4)^{2} - 5 = 2 x 16 - 5 = 32 - 5 = 27
U5 = 2 (5)^{2} - 5 = 2 x 25 - 5 = 50 - 5 = 45
jadi U4 + U5 = 27 + 45 = 72