/*! 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 6 Express the equation in exponent... [FREE SOLUTION] | 91Ó°ÊÓ

91Ó°ÊÓ

Express the equation in exponential form. (a) \(\log _{3} 81=4\) (b) \(\log _{8} 4=\frac{2}{3}\)

Short Answer

Expert verified
(a) \(3^4 = 81\); (b) \(8^{2/3} = 4\).

Step by step solution

01

Understanding Logarithmic Form

The equation \(\log_{b}(x) = y \) means that the base \(b\) raised to the power \(y\) gives \(x\). Our task is to rewrite the logarithmic equation in this form into exponential form using the formula \(b^y = x\).
02

Convert Part (a) to Exponential Form

Given the equation \(\log _{3} 81 = 4\), identify that \(b = 3\), \(y = 4\) and \(x = 81\). Using the exponential form \(b^y = x\), rewrite it as \(3^4 = 81\).
03

Convert Part (b) to Exponential Form

Given the equation \(\log _{8} 4 = \frac{2}{3}\), identify that \(b = 8\), \(y = \frac{2}{3}\) and \(x = 4\). Using the exponential form \(b^y = x\), rewrite it as \(8^{\frac{2}{3}} = 4\).
04

Verify the Solutions

To check the solutions of \(3^4 = 81\) and \(8^{\frac{2}{3}} = 4\), calculate or use the properties of exponents: \(3^4 = 3 \times 3 \times 3 \times 3 = 81\) and \(8^{\frac{2}{3}} = (8^{1/3})^2 = 2^2 = 4\). Both results confirm the correctness of the exponential forms.

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Key Concepts

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

Logarithmic Form
Understanding the logarithmic form is crucial for converting equations between logarithmic and exponential formats. A equation in logarithmic form is expressed as \(\log_{b}(x) = y\). This formulation implies that the base \(b\), when raised to the power \(y\), will yield the value \(x\).
When we say \(\log_{3}(81) = 4\), it translates to the understanding that raising 3 to the power of 4 will result in 81. Similarly, \(\log_{8}(4) = \frac{2}{3}\) indicates that raising 8 to the power of \(\frac{2}{3}\) will result in 4.
This form is very useful in problem-solving because it offers a way to express and manipulate equations involving powers and roots in a more approachable way, especially when the values aren’t immediately obvious.
Exponents
Exponents are a fundamental part of mathematics and occur frequently in logarithmic and exponential forms. An exponent is a small number written above and to the right of a base number. It indicates how many times to multiply the base by itself.
For example, in the expression \(3^4\), 3 is the base and 4 is the exponent, meaning 3 should be multiplied by itself four times: \(3 \times 3 \times 3 \times 3 = 81\).
Exponents also apply to fractions. In \(8^{\frac{2}{3}}\), this exponent implies taking the cube root of 8 and then squaring the result. This is calculated as \((8^{1/3})^2 = 2^2 = 4\). It's essential to understand how to manipulate exponents through addition, subtraction, multiplication, and division rules to solve equations.
Base and Power
The concepts of base and power (or exponent) are integral to understanding both logarithmic and exponential forms. In a mathematical expression like \(b^y = x\), \(b\) is referred to as the base, and \(y\) is the exponent or power. Together, they determine the actual result \(x\).
The base tells you the number you are repeatedly multiplying by itself, and the power tells you how many times to execute this multiplication. This is a key concept in converting between logarithmic and exponential forms.
For instance, in the formula \(3^4 = 81\), "3" represents the base, while "4" is the power. Understanding this concept helps in grasping how to translate from a logarithmic statement like \(\log_{3} 81 = 4\) into its exponential counterpart without confusion. Additionally, knowing how to work with different kinds of bases and powers is essential for mastering more advanced mathematics involving roots and exponential growth or decay.

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