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Barisan Deret1, 4, 9, 16
DItanya suku ke 15
Jawaban
⚛Tentukan Rumus suku ke n
U1 = 1² = 1
U2 = 2² = 4
U3 = 3² = 9
U4 = 4² = 16
Maka, rumus ke n adalah :
Un = n ²
Sehingga suku ke 15 :
U15 = 15² = 15 x 15 = 225
Jawaban A ✔
2 = 2a 3 = 3 + b 1 = 1+0+c
a = 1 b = 0 c = 0
Un = an²+bn+c
U15 = 1(15)² + 0(15) + 0
= 225 +0
= 225
Jawabannya adalah a. 225