Kunci Jawaban Matematika Sukino Kelas X Peminatan Bab 2 LKS 3 Bagian B no 2b

 2. Selesaikan

b. 

³log (2x + 1) - ³log (x - 7) = 2

³log ((2x + 1) / (x - 7)) = ³log 3²

(2x + 1) / (x - 7) = 3²

(2x + 1) / (x - 7) = 9

2x + 1 = 9 (x - 7)

2x + 1 = 9x - 63

2x - 9x = - 63 - 1

- 7x = - 64

x = 64/7

x = 9 1/7