In Exercises 15–58, find each product. (x−1)3

Ch. P - Fundamental Concepts of Algebra

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Blitzer 8th Edition

Ch. P - Fundamental Concepts of Algebra

문제 56

1장, 문제 56

In Exercises 15–58, find each product. (x−1)³

검증된 단계별 안내

Recognize that the problem involves expanding the cube of a binomial, \((x - 1)^3\). This can be expanded using the Binomial Theorem, which states \((a + b)^n = \sum_{k=0}^n \binom{n}{k} a^{n-k} b^k\).

Identify the components of the binomial: \(a = x\), \(b = -1\), and \(n = 3\). Substitute these values into the Binomial Theorem formula.

Write the expanded form of \((x - 1)^3\) using the Binomial Theorem: \(\binom{3}{0}x^3(-1)^0 + \binom{3}{1}x^2(-1)^1 + \binom{3}{2}x^1(-1)^2 + \binom{3}{3}x^0(-1)^3\).

Simplify each term by calculating the binomial coefficients \(\binom{n}{k}\) and the powers of \(-1\). For example, \(\binom{3}{0} = 1\), \(\binom{3}{1} = 3\), \(\binom{3}{2} = 3\), and \(\binom{3}{3} = 1\).

Combine the simplified terms to write the expanded polynomial. The result will be in the form \(x^3 - 3x^2 + 3x - 1\).

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Binomial Expansion

Binomial expansion is a method used to expand expressions that are raised to a power, particularly those in the form of (a + b)^n. The expansion is achieved using the Binomial Theorem, which states that (a + b)^n = Σ (n choose k) * a^(n-k) * b^k, where k ranges from 0 to n. This concept is essential for expanding polynomials like (x - 1)^3.

Cubic Functions

A cubic function is a polynomial of degree three, typically expressed in the form f(x) = ax^3 + bx^2 + cx + d. Understanding cubic functions is crucial for recognizing the behavior of the graph, including its turning points and intercepts. In the context of the question, expanding (x - 1)^3 will yield a cubic polynomial.

Factoring and Simplifying Polynomials

Factoring and simplifying polynomials involves rewriting a polynomial as a product of its factors, which can make it easier to analyze or solve. This process often includes identifying common factors or applying special product formulas. In the case of (x - 1)^3, recognizing it as a repeated factor will aid in both expansion and simplification.