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Evaluate each expression without using a calculator. $$\log _{2} 64$$

Short Answer

Expert verified
\(\log_{2}64 = 6\)

Step by step solution

01

Understanding Logarithms

Express the logarithmic equation \(\log_{2}64\) in exponential form. This means to write it as an equation with a base number of 2 (the base of the logarithm), an exponent (which is what we're solving for), and a result of 64.
02

Convert to exponential form

The exponential form of the equation \(\log_{2}64\) is \(2^x = 64\). Now simple counting or remembering the powers of 2 reveals that \(2^6 = 64\). Therefore, x equals 6.
03

Formulate the answer

After solving the exponentiation, we get the value of x which is 6. So, \(\log_{2}64 = 6\).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Evaluating Logarithms
When it comes to understanding mathematics, evaluating logarithms can often present a challenge to students. However, once the process is demystified, it becomes much more manageable.

At its core, a logarithm asks the question: 'To what power must we raise a certain base to obtain a given number?' For example, the expression \(\log_{2}64\) is asking for the power to which 2 must be raised to result in 64. To evaluate this without a calculator, one approach is to use our knowledge of the powers of 2: \(2^1 = 2\), \(2^2 = 4\), \(2^3 = 8\), and so forth, until we reach \(2^6 = 64\). Thus, \(\log_{2}64 = 6\). Knowing this sequence of powers can make evaluating logarithms a quicker process.

It's important to remember that logarithms and exponents are inverse operations. Just like addition undoes subtraction, logarithms undo exponentiation, which is why they prove to be such a valuable tool in solving exponential equations.
Exponential Form
Another key concept in mathematics and particularly important when working with logarithms is understanding the exponential form. This refers to an expression where a number known as the base is raised to a power or exponent. The exponential form is critical when converting logarithmic expressions to a more visually intuitive format.

For example, converting the logarithmic expression \(\log_{2}64\) to exponential form results in \(2^x = 64\). This visual transformation is incredibly helpful as it directly shows the relationship between the logarithm and exponentiation. It helps us connect the question 'To what power do we raise 2 to get 64?' to its answer '2 must be raised to the power of 6 to equal 64,' simplifying the process of finding the value of x.
Exponents
Exponents are a fundamental part of many mathematical operations and are essential when dealing with logarithms and exponential forms. An exponent dictates how many times a base number is multiplied by itself. For instance, \(2^6\) means 2 is multiplied by itself 6 times: \(2 \times 2 \times 2 \times 2 \times 2 \times 2\).

Understanding how to calculate and recognize exponents is key in simplifying complex expressions and serves as a bridge to grasping more advanced concepts. It's beneficial to familiarize oneself with the common bases like 2, 10, and e (the base of the natural logarithm) and their first several powers. This knowledge assists in quickly evaluating logarithmic expressions and translating between logarithmic and exponential forms.

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