Question
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Tentukan nilai \( x \) yang memenuhi persamaan \( { }^{3} \log (2 x-1)=2 \). A. 4 B. \( 4 \frac{1}{2} \) C. 5 D. \( 5 \frac{1}{2} \) E. 6

Ask by Vargas Garza. in Indonesia
Feb 25,2025

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Tutor-Verified Answer

Answer

The value of \( x \) is 5.

Solution

We are given the equation log₃(2x - 1) = 2. To solve for x, we can rewrite the equation in its exponential form:   3² = 2x - 1 This gives:   9 = 2x - 1 Next, add 1 to both sides:   9 + 1 = 2x   10 = 2x Now, divide both sides by 2:   x = 10 / 2   x = 5 Thus, the correct answer is 5 (option C).

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Mind Expander

Untuk menyelesaikan persamaan \( { }^{3} \log (2 x-1)=2 \), kita perlu mengubah bentuk logaritma menjadi bentuk eksponensial. Dari persamaan tersebut, kita dapat menuliskannya sebagai: \[ 2 x - 1 = 3^2 \] Artinya: \[ 2 x - 1 = 9 \] Kemudian, kita tambahkan 1 ke kedua sisi: \[ 2 x = 10 \] Lalu, kita bagi kedua sisi dengan 2: \[ x = 5 \] Jadi, nilai \( x \) yang memenuhi persamaan tersebut adalah C. 5.

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