Chapter 7: Problem 7
$$(t-1)^{4}$$
Short Answer
Expert verified
The expanded form of \((t-1)^{4}\) is \(t^{4} - 4t^{3} + 6t^{2} - 4t + 1\).
Step by step solution
01
Understanding the Binomial Theorem
The binomial theorem states that for any numbers \(a\) and \(b\) and non-negative integer \(n\), \((a + b)^{n}\) can be expanded into the sum of successive terms in the form \(\binom{n}{k} a^{n-k} b^{k}\) where \(\binom{n}{k}\) is the binomial coefficient. In this exercise, \(a = t\) and \(b = -1\).
02
Applying Binomial Theorem
Applying the binomial theorem to \((t - 1)^{4}\) leads to: \(\binom{4}{0} t^{4} (-1)^{0} + \binom{4}{1} t^{3} (-1)^{1} + \binom{4}{2} t^{2} (-1)^{2} + \binom{4}{3} t^{1} (-1)^{3} + \binom{4}{4} t^{0} (-1)^{4}\).
03
Simplify
Simplifying the resulting equation from Step 2 gives us: \(t^{4} - 4t^{3} + 6t^{2} - 4t + 1\).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Polynomial Expansion
When faced with the task of raising an expression like \(t - 1\) to the power of 4, there are handy techniques available like polynomial expansion. Essentially, this is a method used to express a power of a binomial as a sum of terms involving powers of its individual expressions. Using the Binomial Theorem simplifies polynomial expansion dramatically, because it provides a structured way to expand a binomial expression of the form \(a + b\) raised to any power \(n\).
To understand this, take each term in the expansion of \( (t - 1)^4 \) which is derived by applying the theorem. Each term takes into account different powers of \(t\) and \(-1)\) combined in a systematic manner. These terms are expressed as \(\binom{n}{k} a^{n-k} b^{k}\), which accommodates the descending and ascending power progression in the expanded form.
To break it down:
To understand this, take each term in the expansion of \( (t - 1)^4 \) which is derived by applying the theorem. Each term takes into account different powers of \(t\) and \(-1)\) combined in a systematic manner. These terms are expressed as \(\binom{n}{k} a^{n-k} b^{k}\), which accommodates the descending and ascending power progression in the expanded form.
To break it down:
- Start at the highest power of your main variable; here, it's \(t^{4}\).
- You descend one power of \(t\) for each subsequent term until you reach \(t^{0}\).
- Simultaneously, you start from \((-1)^{0}\) and increase it by 1 power per term until you reach \((-1)^{4}\).
Binomial Coefficient
Binomial coefficients form the backbone of the binomial theorem. These coefficients can be seen in Pascal's triangle, and they determine the relative weight of each term in a binomial expansion. For an expression \( (t - 1)^4 \), these coefficients dictate how the contributions of each expansion term are balanced in the final polynomial.
A binomial coefficient is written as \(\binom{n}{k}\) and is calculated using the formula:
These coefficients are not just random numbers but arise from a well-established combinatorial concept, which illustrates different ways of picking items from sets, contributing to the methodical structure of expanded algebraic expressions.
A binomial coefficient is written as \(\binom{n}{k}\) and is calculated using the formula:
- \(\binom{n}{k} = \frac{n!}{k!(n-k)!}\)
These coefficients are not just random numbers but arise from a well-established combinatorial concept, which illustrates different ways of picking items from sets, contributing to the methodical structure of expanded algebraic expressions.
Algebraic Expressions
Algebraic expressions get a thorough workout through problems like expanding \( (t-1)^4 \). These expressions consist of variables, constants, and mathematical operations like addition and multiplication, all combined to convey a mathematical relationship.
Understanding how algebraic expressions behave when manipulated provides deeper insights into solving algebraic equations and simplifying expressions. When you expand something like \( (t-1)^4 \), you're essentially unraveling an algebraic expression to expose its simpler components. This expansion is not merely multiplying terms but involves combining powers and coefficients in specific patterns to result in a normal polynomial form.
In algebraic terms:
Understanding how algebraic expressions behave when manipulated provides deeper insights into solving algebraic equations and simplifying expressions. When you expand something like \( (t-1)^4 \), you're essentially unraveling an algebraic expression to expose its simpler components. This expansion is not merely multiplying terms but involves combining powers and coefficients in specific patterns to result in a normal polynomial form.
In algebraic terms:
- The variable \(t\) is raised to different powers depending on its position in the expansion.
- The constants involved, like \(-1\), affect the sign of the terms depending on whether they are raised to even or odd powers.
- The coefficients from binomial coefficients further modify the terms' contribution in the final expression.