/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 34 Solve the equation for \(x.\) ... [FREE SOLUTION] | 91Ó°ÊÓ

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Solve the equation for \(x.\) $$\log _{3} 3^{-5}=x$$

Short Answer

Expert verified
The solution to the equation \(\log _{3}3^{-5}=x\) is \(x = -5.\)

Step by step solution

01

Understanding the base

Given that the base of the logarithm is the same as the base of the exponent inside the function, the logarithm will simplify to the exponent: \( \log_{3}3^{n} = n. \) Thus, the equation simplifies substantially.
02

Apply inverse relationship of the logarithm and exponent

Applying this inverse relationship yields \( \log_{3}3^{-5} = -5.\) The logarithm simplifies to the exponent of the inner term.
03

Assign the value to x

Predictably, \(x\) takes the same value as the simplified logarithm, which results in \(x = -5.\)

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Key Concepts

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

Exponents
Exponents are a way of expressing repeated multiplication of the same number. When we say a number is raised to an exponent, we mean that number is multiplied by itself a specific number of times. For example, \(3^4\) means \(3\) multiplied by itself \(4\) times, or \(3 \times 3 \times 3 \times 3\). Exponents can be positive, negative, or zero. Positive exponents denote standard repeated multiplication. Negative exponents, on the other hand, symbolize the reciprocal of the number raised to the opposite positive exponent. This means \(3^{-5}\) can be rewritten as \(\frac{1}{3^5}\). Understanding exponents is crucial when working with logarithms, because they are often used to simplify and rearrange equations, especially in algebra. Moreover, simple manipulations with exponents, like turning \(b^{-n}\) into \(\frac{1}{b^n}\), can make equations more soluble.
Logarithm Properties
Logarithms are the inverse operations of exponents. Essentially, they answer the question: "To what power must the base be raised, to produce a given number?". For instance, in \(\log_{3} 81 = 4\), the logarithm is asking what power 3 must be raised to, in order to get 81, which is 4.When working with logarithms, it's important to understand some key properties:
  • Product property: \(\log_{b}(MN) = \log_{b}M + \log_{b}N\)
  • Quotient property: \(\log_{b}(\frac{M}{N}) = \log_{b}M - \log_{b}N\)
  • Power property: \(\log_{b}(M^n) = n\cdot \log_{b}M\)
  • Change of base formula: \(\log_{b}M = \frac{\log_{k}M}{\log_{k}b}\) for any positive number \(k\)
Being familiar with these properties allows for the simplification of complex equations, as demonstrated in the original problem, where the equation was reduced to a simple term using the inverse property.
Inverse Relationships
Inverse relationships in mathematics occur when one operation completely undoes another. Logarithms and exponents are inverse operations, meaning they can cancel each other out. For instance, if you take a logarithm of an exponent with the same base, like \(\log_{b}(b^x)\), the result will be \(x\). This is known as the identity rule for logarithms. In solving logarithmic equations, recognizing these inverse relationships can lead to direct solutions, as they allow for the canceling out of complex terms, reducing them to more manageable forms. Here’s how this applies: In the given problem, \(\log_{3} 3^{-5}\) was simplified directly to \(-5\) because the logarithm undoes the exponent precisely. The base \(3\) cancels out, and you're left with the simple exponent \(-5\). This is why logarithms are a powerful tool in algebra—they simplify the process of finding variables buried inside exponential expressions.

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Most popular questions from this chapter

Use the regression feature of a graphing utility to find a power model \(y=a x^{b}\) for the data and identify the coefficient of determination. Use the graphing utility to plot the data and graph the model in the same viewing window. $$(0.5, 1.0), (2, 12.5), (4, 33.2), (6, 65.7), (8, 98.5),(10, 150.0)$$

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