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r = -√2
s10 = a(1 - r¹⁰) /( 1 - r)
s10 = 2 (1 - (√2)¹⁰ ) / ( 1 - √2)
s10 = 2(1 - 32) /( 1 - √2)
s10 = - 62/(1 - √2) = -62(1 + √2) /( 1 - 2)
s10 = - 62 /(-1) (1 + √2) = 62 ( 1 + √2)
semoga membantu
-alya❤
r = -√2
s10 = a(1 - r¹⁰) /( 1 - r)
s10 = 2 (1 - (√2)¹⁰ ) / ( 1 - (-√2)
s10 = 2(1 - 32) /( 1 + √2)
s10 = - 62/(1 +√2) = -62(1 - √2) /( 1 - 2)
s10 = - 62(1 -√2)/-1= 62 ( 1 - √2)
Ini yang benarnya.
coba perhatikan tanda positif negatifnya kalau mengerjakan matematika, kalian harus teliti