Tentukan suku ke5 barisan geometri jika U2=4 dan u4=16
Matematika
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Pertanyaan
Tentukan suku ke5 barisan geometri jika U2=4 dan u4=16
1 Jawaban
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1. Jawaban mhannyp
Un = ar^(n-1)
U2 = ar = 4
U4 = ar^3 = 16
ar^3 = 16
ar. r^2 = 16
4 r^2 = 16
r^2 = 16/4
r^2 = 4
r^2 = 2^2
r = 2
ar = 4
2a = 4
a = 4/2
a = 2
U5 = ar^4 = 2 (2^4) = 2 (16) = 32