Penjelasan dengan langkah-langkah:
—Nomor 2
Un = n² + 2n - 5
U11 = 11² + 2.11 - 5
U11 = 121 + 22 - 5
U11 = 138 Jawabannya
—Nomor 3
-4,12,-36
a = -4
r = 12/-4 = -3
U4 = a x r^(n - 1)
U4 = -4 x (-3)^(4 - 1)
U4 = -4 x (-3)^3
U4 = -4 x (-27)
U4 = 108 Jawabannya
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Penjelasan dengan langkah-langkah:
—Nomor 2
Un = n² + 2n - 5
U11 = 11² + 2.11 - 5
U11 = 121 + 22 - 5
U11 = 138 Jawabannya
—Nomor 3
-4,12,-36
a = -4
r = 12/-4 = -3
U4 = a x r^(n - 1)
U4 = -4 x (-3)^(4 - 1)
U4 = -4 x (-3)^3
U4 = -4 x (-27)
U4 = 108 Jawabannya