\log_2(8x) = 5 - Tacotoon

Solving log₂(8x) = 5: A Step-by-Step Guide with Full Explanation

Understanding logarithms is essential in algebra and many areas of science and engineering. One commonly encountered equation is log₂(8x) = 5. Whether you're a student tackling logarithmic expressions or a teacher explaining key concepts, knowing how to solve such equations is invaluable.

In this article, we break down how to solve log₂(8x) = 5, explain the underlying principles, and highlight why this type of problem matters.

Understanding the Context

What is log₂(8x) = 5?

The expression log₂(8x) = 5 means: “To what power must 2 raise to get the value of 8x?”
This logarithmic equation translates into a simple exponential form, which makes it straightforward to solve.

$\log_2(8x) = 5$

Key Insights

Step-by-Step Solution

Step 1: Convert to exponential form

Recall that the equation log_b(A) = C is equivalent to b^C = A.
Here, base b = 2, A = 8x, and C = 5. Therefore:

$$
2^5 = 8x
$$

Step 2: Evaluate 2⁵

Calculate the left side:

$$
32 = 8x
$$

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Final Thoughts

Step 3: Solve for x

Divide both sides by 8 to isolate x:

$$
x = rac{32}{8} = 4
$$

Final Answer:

$$
oxed{x = 4}
$$

Why This Equation Matters

Logarithmic Equations Develop Log Skills: Mastering such equations strengthens your ability to work with variables inside logarithms, a crucial skill in advanced math and calculus.
Real-World Applications: Logarithms model phenomena involving growth rates, sound intensity (decibels), earthquake magnitude (Richter scale), computer algorithms, and more.
Foundation for Advanced Topics: Understanding how to solve log equations prepares you for solving complex logarithmic expressions and inequalities in higher-level mathematics.

Quick Tips When Solving log₂(8x) = 5

Always convert logarithmic equations to exponential form.
Simplify coefficients—here, 2⁵ = 32.
Isolate the variable by dividing both sides appropriately.
Always check solutions by substituting back into the original equation, especially when variables are inside the logarithm.