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U8 = S8 - S7
= (2(8)² + 4.8) - (2(7)² + 4.7)
= (128 + 32) - (98 + 28)
= 160 - 126
= 34
U5 = S5 - S4
= (2(5)² + 4.5) - (2(4)² + 4.4)
= (50 + 20) - (32 + 16)
= 70 - 48
= 22
U8 - U5 = 34 - 22 = 12
semoga membantu :)
Rumus:
Pembuktian:
---> (kurangi)
maka,
= 160 - 126
= 34
= 70 - 48
= 22
= 12