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Question 6

What is the value of [tex]\( x \)[/tex] in the logarithmic equation?

[tex]\[ \log _x 216 = 3 \][/tex]

Hint: Convert the logarithmic equation to an exponential equation.
[tex]\[ \log _b(y)=x \Leftrightarrow b^x=y \][/tex]

A. [tex]\( x=6 \)[/tex]

B. [tex]\( x=72 \)[/tex]

C. [tex]\( x=36 \)[/tex]


Sagot :

To solve the logarithmic equation [tex]\(\log_x 216 = 3\)[/tex], let's follow the steps outlined in the hint. We'll convert the logarithmic form to an exponential form.

1. Start with the given equation:
[tex]\[ \log_x 216 = 3 \][/tex]

2. Convert the logarithmic equation to its exponential form:
[tex]\[ x^3 = 216 \][/tex]
This step is based on the property of logarithms which states that [tex]\(\log_b (y) = x \Leftrightarrow b^x = y\)[/tex].

3. Solve the exponential equation:
To find [tex]\(x\)[/tex], we need to take the cube root of both sides of the equation:
[tex]\[ x = \sqrt[3]{216} \][/tex]

4. Evaluate the cube root of 216:
[tex]\[ \sqrt[3]{216} \approx 5.999999999999999 \][/tex]

Given the choices:
- A) [tex]\(x = 6\)[/tex]
- B) [tex]\(x = 72\)[/tex]
- C) [tex]\(x = 36\)[/tex]

Given that [tex]\(\sqrt[3]{216}\)[/tex] is very close to 6, it means the value of [tex]\(x\)[/tex] is approximately 6. Therefore, the correct answer is:

[tex]\[ \boxed{x = 6} \][/tex]