Chapter 10: Problem 4
Solve each of the equations. $$ 2^{2 x}=16 $$
Short Answer
Expert verified
\(x = 2\).
Step by step solution
01
Understand the Equation
The given equation is \(2^{2x} = 16\). Our goal is to solve for \(x\). Notice that the left-hand side is an exponential expression with base 2.
02
Express Both Sides with the Same Base
Recognize that 16 can be expressed as a power of 2. Specifically, \(16 = 2^4\). So we rewrite the equation as \(2^{2x} = 2^4\).
03
Set the Exponents Equal
Since the bases are the same, we set the exponents equal to each other: \(2x = 4\).
04
Solve for x
To find \(x\), divide both sides of the equation by 2: \(x = \frac{4}{2}\).
05
Simplify
Simplify \(x = \frac{4}{2}\) to get \(x = 2\).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Solving Equations
Solving equations is a fundamental concept in mathematics that involves finding the values of variables that make the equation true. In the exercise provided, we aim to solve the equation \(2^{2x} = 16\). The process of solving an equation typically involves the following steps:
Exponential equations, like the one in our exercise, can often be easily solved by leveraging properties of exponents.
- Identify the type of equation you are dealing with. In this case, it is an exponential equation.
- Express both sides of the equation in a form that will allow you to compare coefficients, such as converting numbers to the same base.
- Set the equations of the same base equal to each other to isolate the variable.
- Solve for the unknown variable.
Exponential equations, like the one in our exercise, can often be easily solved by leveraging properties of exponents.
Exponents
Exponents, also known as powers, are a way to express repeated multiplication of a number by itself. For instance, \(2^4\) means we multiply 2 by itself four times, equating to 16. Understanding the properties of exponents simplifies many equations and mathematical expressions. Here are some key concepts about exponents:
This foundational knowledge about exponents is useful in solving exponential equations, streamlining the process of polynomial simplifications and solutions.
- An exponent indicates how many times the base is used as a factor.
- The expression \(a^b\) is called an exponential expression, where \(a\) is the base and \(b\) is the exponent.
- When the bases are the same, you can set the exponents equal if you have an equality like \(a^c = a^d\).
This foundational knowledge about exponents is useful in solving exponential equations, streamlining the process of polynomial simplifications and solutions.
Base of Power
The concept of the base of a power is central to understanding exponential equations. The base is the number that is being raised to a power by the exponent. In our exercise, the number 2 is referred to as the "base". Understanding this allows us to manipulate equations effectively:
Practicing identifying and using the base of power enhances your ability to tackle a wide range of mathematical problems, from simple algebraic equations to more complex calculus-based scenarios.
- The base of a power remains constant in any identical conversion of the expression.
- Recognizing equivalent bases on both sides of an equation lets us set the exponents equal.
- Rewriting numbers in terms of a common base can often simplify or solve equations more efficiently.
Practicing identifying and using the base of power enhances your ability to tackle a wide range of mathematical problems, from simple algebraic equations to more complex calculus-based scenarios.