In Exercises 15–58, find each product. (2x−3)3

Ch. P - Fundamental Concepts of Algebra

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Ch. P - Fundamental Concepts of Algebra

문제 58

1장, 문제 58

In Exercises 15–58, find each product. (2x−3)³

검증된 단계별 안내

Recognize that the expression \((2x - 3)^3\) represents a binomial raised to the third power. To expand this, we can use 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: \(a = 2x\), \(b = -3\), and \(n = 3\).

Apply the Binomial Theorem to expand \((2x - 3)^3\): \((2x - 3)^3 = \binom{3}{0}(2x)^3(-3)^0 + \binom{3}{1}(2x)^2(-3)^1 + \binom{3}{2}(2x)^1(-3)^2 + \binom{3}{3}(2x)^0(-3)^3\).

Simplify each term in the expansion: \(\binom{3}{0}(2x)^3(-3)^0\), \(\binom{3}{1}(2x)^2(-3)^1\), \(\binom{3}{2}(2x)^1(-3)^2\), and \(\binom{3}{3}(2x)^0(-3)^3\). Use the binomial coefficients \(\binom{3}{k}\) and simplify powers of \(2x\) and \(-3\).

Combine all the simplified terms to write the expanded form of \((2x - 3)^3\).

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주요 개념

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Binomial Expansion

Binomial expansion refers to the process of expanding expressions that are raised to a power, particularly those in the form of (a + b)^n. The expansion can be systematically 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 theorem allows for the calculation of each term in the expansion without needing to multiply the binomial repeatedly.

Cubic Expansion

Cubic expansion specifically deals with the expansion of a binomial raised to the third power, such as (a + b)^3. The result can be expressed as a^3 + 3a^2b + 3ab^2 + b^3. Understanding this pattern is crucial for efficiently calculating the product of a binomial raised to the third power, as it simplifies the process and avoids lengthy multiplication.

Polynomial Multiplication

Polynomial multiplication involves multiplying two or more polynomials to produce a new polynomial. This process requires distributing each term in one polynomial to every term in the other, often using the distributive property or the FOIL method for binomials. Mastery of polynomial multiplication is essential for solving problems like (2x - 3)^3, as it forms the basis for combining like terms and simplifying the resulting expression.