Chapter 5: Problem 60
Mixed Practice Multiply. $$ (b-2)^{2} $$
Short Answer
Expert verified
The expression \((b-2)^2\) simplifies to \(b^2 - 4b + 4\).
Step by step solution
01
Understand the Problem
The problem requires us to square the binomial expression \((b - 2)\). This involves multiplying the binomial \((b - 2)\) by itself.
02
Set Up the Multiplication
Write the expression as a multiplication problem: \((b - 2) \times (b - 2)\). This indicates we are performing a binomial expansion.
03
Apply the Distributive Property
Use the distributive property to expand the expression: - First, multiply \(b\) by both terms in the second parenthesis: \(b \times b + b \times (-2)\).- Then, multiply \(-2\) by both terms in the second parenthesis: \(-2 \times b + (-2) \times (-2)\).
04
Perform the Multiplications
Calculate each multiplication:- \(b \times b = b^2\)- \(b \times (-2) = -2b\)- \(-2 \times b = -2b\)- \(-2 \times (-2) = 4\)
05
Combine Like Terms
Add the results from step 4:\(b^2 - 2b - 2b + 4\).Combine the like terms \(-2b - 2b\), which results in \(-4b\).
06
Write the Final Expression
The expanded and simplified expression of \((b - 2)^2\) is:\(b^2 - 4b + 4\).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Distributive Property
The distributive property is a fundamental concept in algebra that allows us to multiply a single term by each term inside a set of parentheses. It's often used when dealing with expressions involving parentheses, ensuring every part of the equation is expanded correctly.
To illustrate, take the binomial \( (b - 2)^2 \). To expand this, we rewrite it as \( (b-2) imes (b-2) \), and apply the distributive property in steps:
This approach ensures that no terms are forgotten, making it a reliable method for expanding binomials and polynomials.
To illustrate, take the binomial \( (b - 2)^2 \). To expand this, we rewrite it as \( (b-2) imes (b-2) \), and apply the distributive property in steps:
- Multiply the first term in the first binomial with each term in the second binomial.
- Multiply the second term in the first binomial with each term in the second binomial.
This approach ensures that no terms are forgotten, making it a reliable method for expanding binomials and polynomials.
Algebraic Multiplication
Algebraic multiplication involves multiplying algebraic expressions to simplify or expand them. This is key in binomial expansions such as \( (b - 2)^2 \).
In our example, multiplying \( (b-2) imes (b-2) \) means performing set muliplications:
In our example, multiplying \( (b-2) imes (b-2) \) means performing set muliplications:
- Multiply \( b \) by \( b \) to get \( b^2 \).
- Multiply \( b \) by \( -2 \) to get \( -2b \).
- Multiply \( -2 \) by \( b \) to again get \( -2b \).
- Finally, multiply \( -2 \) by \( -2 \) to get \( 4 \).
Combining Like Terms
Combining like terms is a crucial process in simplifying algebraic expressions. It involves adding or subtracting terms that have the same variable raised to the same power. After expanding the expression \( (b - 2)^2 \), we obtain several terms, which need to be combined to simplify the expression.
From our multiplication results, we get:
Ultimately, the simplified expression is \( b^2 - 4b + 4 \). This process allows for clearer and more concise expression results, making it easier to understand and further manipulate these results in algebraic problems.
From our multiplication results, we get:
- \( b^2 \)
- \( -2b \)
- \( -2b \)
- \( 4 \)
Ultimately, the simplified expression is \( b^2 - 4b + 4 \). This process allows for clearer and more concise expression results, making it easier to understand and further manipulate these results in algebraic problems.