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91Ó°ÊÓ

Evaluate each logarithm. Do not use a calculator. $$\log 1,000,000$$

Short Answer

Expert verified
The value of the logarithm \(\log 1,000,000\) equals 6.

Step by step solution

01

Understand the meaning of the logarithm

Looking at \(\log 1,000,000\), this can be interpreted as 'to what power must 10 be raised to get 1,000,000?'.
02

Break down the number into prime factors

One way to calculate this without a calculator is to break the number down into its prime factors. In this case, 1,000,000 can be expressed as \(10^6\).
03

Apply the logarithm rule for powers

According to the laws of logarithms, the exponent to which the base number is raised can be moved to the front of the logarithm. Thus, \(\log(10^6)\) is equivalent to \(6*\log10\). Now, we know that \(\log10\) equals 1 as the base of 10 logarithm is the number 10. So the final answer can be calculated as \(6*1\).

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Key Concepts

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

Logarithm rules
Logarithm rules help simplify complex logarithmic expressions and enable us to solve them without a calculator. For instance, one crucial rule is the "Power Rule for Logarithms".
This rule states that if you have a logarithm of a number that is raised to a power, you can move that power to the front of the logarithm.
Mathematically, this is expressed as \(\log_b(a^n) = n \cdot \log_b(a)\).This is particularly useful when dealing with large numbers that are powers of other smaller numbers, such as in the example \(\log(10^6)\).
The power, 6, is moved in front of the logarithm, making calculations straightforward.
Understanding and applying this rule simplifies problem-solving significantly.
Additionally, it's important to know the "Product Rule" and "Quotient Rule" for logarithms:
  • Product Rule: \(\log_b(M \times N) = \log_b(M) + \log_b(N)\)
  • Quotient Rule: \(\log_b(M / N) = \log_b(M) - \log_b(N)\)
These rules are fundamental when breaking down more complicated logarithmic expressions into simpler components.
Exponents
Exponents are a concise way to represent repeated multiplication of a number by itself.
If you have a base number, let's say 10, and you multiply it by itself, say 6 times, it can be written using an exponent as \(10^6\).
In our exercise, the number 1,000,000 was broken down into its prime factors, expressed as \(10^6\).
The base (10) is multiplied by itself 6 times. Exponents help simplify expressions and calculations significantly, especially when handling large numbers.
Another important aspect of exponents is understanding negative exponents and zero exponents:
  • Negative Exponents indicate reciprocal. For example, \(10^{-n} = \frac{1}{10^n}\).
  • Zero Exponent means that any number raised to the power of 0 gives you 1, \(a^0 = 1\) given \(a eq 0\).
Exponents are foundational in understanding and working with logarithms, as logarithms are essentially the inverse operations of exponents.
Base 10 logarithms
Base 10 logarithms, also known as "common logarithms," use 10 as the base for the logarithm.
This is quite convenient because many natural and scientific measurements, like the decimal system, are inherently base 10.
When you see \(\log\) without any subscript indicating the base, it’s assumed to be base 10.The question "\(\log 1,000,000\)" specifically looks for the power to which you raise the number 10 to get 1,000,000.
By expressing 1,000,000 as \(10^6\), and using the fact that \(\log_{10}10 = 1\), you find that the solution is simply 6.
Base 10 logarithms simplify many real-world problems, including growth rates and exponential decay. When mastering logs, always start by recognizing the role of the base and using logarithmic identities to solve the problem systematically.
Base 10 logs are intuitive and typically the first logs taught because of their wide application and ease of use in basic arithmetic and algebra.

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