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Verified answer
Barisan dan DeretUn = 2n^2 - 5
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
U4 + U5 = 27 + 45
= 72 (C).
*semoga membantu. sukses selalu ^_^
u4=2(4)²-5
=64-5
=59
u5=2(5)²-5
=100-5
=95
u4+u5=59+95
=a.154
semoga bermanfaat
maaf jika jawaban saya salah