Problem 74 - Algebra A Combined Function

Question

Simplify. $$ \log _{2} 2 $$

Step-by-Step Solution

Answer

The simplified form is 1.

Step 1: Understanding Logarithm Basics

Before simplifying, remember the basic property of logarithms: \( \log_b b = 1 \). This means if the base of the logarithm is the same as the number being logged, the result is 1.

Step 2: Applying the Logarithm Rule

Apply the rule from Step 1 directly to the given expression. Here, the base of the logarithm is 2 and the number is also 2, which matches the condition from Step 1.

Step 3: Calculate the Result

With \( \log_{2} 2 \), apply the rule and immediately determine that \( \log_{2} 2 = 1 \) by the identity property of logarithms.

Key Concepts

Identity Property of Logarithms

The identity property of logarithms is a fundamental concept that simplifies many expressions. This property states that for any non-zero base \( b \), the logarithm of \( b \) with itself returns 1, or formally, \( \log_b b = 1 \). This is because a logarithm answers the question, "To what power must the base be raised, to produce this number?" In this case, \( b^1 = b \), so the logarithm returns 1.

• Example: \( \log_5 5 = 1 \) since \( 5^1 = 5 \).
• Another example: \( \log_{10} 10 = 1 \) because \( 10^1 = 10 \).

Understanding this property helps in solving and simplifying logarithmic problems efficiently. Just remember, the base must be non-zero and can be any positive number other than one. When applied correctly, it makes many logarithmic calculations immediate and straightforward.

Logarithm Basics

Before tackling complex logarithmic problems, it's crucial to grasp the basic principles of logarithms. Logarithms are the inverses of exponents. For a given base \( b \), the logarithm of a number \( x \) answers the question: What power must \( b \) be raised to, to equal \( x \)?

• The expression \( \log_b x = n \) means \( b^n = x \).
• Common bases include 10 (common logarithm) and \( e \) (natural logarithm).

Logarithms have several useful properties:

• Product Rule: \( \log_b (xy) = \log_b x + \log_b y \)
• Quotient Rule: \( \log_b \left(\frac{x}{y}\right) = \log_b x - \log_b y \)
• Power Rule: \( \log_b (x^n) = n\log_b x \)

Knowing these basics is essential for simplifying expressions and understanding more intricate logarithmic concepts.

Simplifying Logarithms

Simplifying logarithms often involves applying the identity property and other fundamental rules. Simplification makes complex problems manageable and clarified. When encountering a logarithm of the form \( \log_b b \), apply the identity property immediately to simplify to 1.For other expressions, leverage the key properties:

• Use the Product Rule to split logarithms of products into sums.
• Apply the Quotient Rule to break down logarithms of fractions into differences.
• Harness the Power Rule to bring down exponents and simplify further.

For instance, to simplify \( \log_3 9 \):1. Recognize 9 as \( 3^2 \).2. Apply the power rule: \( \log_3 (3^2) = 2\log_3 3 \).3. Simplify further using the identity property: \( \log_3 3 = 1 \), so \( 2\log_3 3 = 2 \times 1 = 2 \).These techniques serve as powerful tools in analyzing and simplifying logarithmic expressions, turning daunting problems into simpler, more navigable ones.