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Chapter 1: Problem 9

Classify each item as an algebraic expression or an equation. a. \(m+18=23 \quad\) b. \(m+18\)

Short Answer

Expert verified
a is an equation; b is an algebraic expression.

Step by step solution

01

Identify the Characteristics of an Equation

An equation is a mathematical statement that asserts the equality of two expressions. It contains an equal sign '='. For example, in the expression \(m+18=23\), the presence of '=' indicates it's an equation.
02

Identify the Characteristics of an Algebraic Expression

An algebraic expression is a mathematical phrase that can include numbers, variables, and operation symbols, but it does not have an equal sign. The expression \(m+18\) lacks an '=', so it is an algebraic expression.
03

Classify the Items

Based on the characteristics: - Item a, \(m+18=23\), is an equation because it contains an equal sign.- Item b, \(m+18\), is an algebraic expression because it does not contain an equal sign.

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Key Concepts

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

Equations
Equations are fundamental tools in algebra that express the equality between two expressions. When you see an equation, the equal sign '=' is the key feature that stands out. It tells us that what is on the left side of the equation is the same as what is on the right side. This balance is the essence of equations. Let's consider the example:
  • Suppose you have an equation like \( m + 18 = 23 \). This tells you that when you add 18 to the variable \( m \), the result is 23.
  • To solve equations, you often need to figure out what value of the variable will make both sides of the equation equal. For \( m + 18 = 23 \), subtracting 18 from both sides reveals that \( m = 5 \).
So, equations are not only about recognizing the equal sign but also about finding balance and solving for unknowns.
Variables
Variables act as placeholders for numbers we do not yet know or numbers that can change. In algebra, we often use variables like letters from the alphabet - such as \( m, x, y \) - to represent these unknowns. They are what make algebra versatile and powerful.
  • In our example, the letter \( m \) is a variable. It stands in for a number that will make the equation or expression true.
  • Variables allow you to formulate expressions and equations without knowing precise numbers, which is a powerful way to tackle different types of problems.
  • Whether in equations or expressions, variables are fundamental to composing algebraic structures.
Think of variables as the "mystery" element that you need to solve in equations or that allows flexibility in expressions.
Mathematical Symbols
Mathematical symbols are the language of mathematics, and they help us communicate complex ideas succinctly. In algebra, these symbols include operations like addition (+), subtraction (-), and many others.
  • For example, in the expression \( m+18 \), the symbol '+' tells us to take the variable \( m \) and add 18 to it.
  • Symbols like '=' in equations indicate equality, which is central to understanding and solving equations.
  • Besides '+', symbols such as '*', '/', and '^' (for exponentiation) are also commonly used in algebra.
These symbols are a universal form of communication in math that allow us to write and solve problems efficiently. Learning to read and use these symbols is like learning a new language that opens up the world of mathematics.

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Most popular questions from this chapter

Express each statement using one of the words sum product, difference, or quotient. $$ 11-9=2 $$

Complete the table. $$ \begin{array}{|c|c|c|} \hline & {\text { Opposite }} & {\text { Reciprocal }} \\ \hline \text { Number } & {\text { (additive inverse) }} & {\text { (multiplicative inverse) }} \\ \hline 2 & {} \\ \hline-\frac{4}{5} & {} \\ \hline 1.75 & {} \\ \hline \end{array} $$

Fill in the blanks. \(\sqrt{2}\) is read "the______ _____ of \(2 "\)

Answer with an algebraic expression. See Example 9. A sales clerk earns \(\$ x\) an hour; how much does he earn in an 8 -hour day?

Multiply. See Example 1. $$ 1.2(-0.4) $$
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