Factor each polynomial. See Examples 5 and 6. 27-r3

Ch. R - Review of Basic Concepts

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Lial 13th Edition

Ch. R - Review of Basic Concepts

문제 74

1장, 문제 74

Factor each polynomial. See Examples 5 and 6. 27-r³

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Recognize that the expression $27 - r^3$ is a difference of cubes because $27$ can be written as \$3^3$ and $r^3$ is already a cube.

Recall the formula for factoring a difference of cubes: $a^3 - b^3 = (a - b)(a^2 + ab + b^2)$.

Identify $a$ and $b$ in the expression: here, $a = 3$ and $b = r$.

Apply the difference of cubes formula by substituting $a$ and $b$: write the factorization as $(3 - r)(3^2 + 3 imes r + r^2)$.

Simplify the terms inside the second parenthesis: $3^2 = 9$, so the factorization becomes $(3 - r)(9 + 3r + r^2)$.

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주요 개념

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

Difference of Cubes

The difference of cubes formula is used to factor expressions of the form a³ - b³. It factors into (a - b)(a² + ab + b²). Recognizing this pattern allows you to break down cubic expressions into simpler polynomial factors.

Identifying Cube Terms

To apply the difference of cubes formula, you must identify terms that are perfect cubes. For example, 27 is 3³ and r³ is the cube of r. Recognizing these helps in rewriting the expression in the form a³ - b³.

Polynomial Factoring Techniques

Factoring polynomials involves rewriting them as products of simpler polynomials. Understanding various factoring methods, such as factoring out the greatest common factor or special products like difference of squares and cubes, is essential for simplifying expressions.