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Verified answer
Bab PerbandinganMatematika SMP Kelas IX
a + ar = 25
a (1 + r) = 25
a = 25/(1 + r)
ar² + ar³ = 25
a (r² + r³) = 25
a = 25/(r² + r³)
25/(1 + r) = 25/(r³ + r²)
***coret 25***
r³ + r² = 1 + r
r³ + r² - r - 1 = 0
r = 1