Find the domain of each rational expression. See Example 1. (x² - 1) / (x + 1)
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- 0. Review of College Algebra4h 45m
- 1. Measuring Angles40m
- 2. Trigonometric Functions on Right Triangles2h 5m
- 3. Unit Circle1h 19m
- 4. Graphing Trigonometric Functions1h 19m
- 5. Inverse Trigonometric Functions and Basic Trigonometric Equations1h 41m
- 6. Trigonometric Identities and More Equations2h 34m
- 7. Non-Right Triangles1h 38m
- 8. Vectors2h 25m
- 9. Polar Equations2h 5m
- 10. Parametric Equations1h 6m
- 11. Graphing Complex Numbers1h 7m
0. Review of College Algebra
Rationalizing Denominators
Problem 25
Textbook Question
Write each rational expression in lowest terms. See Example 2. (8k + 16) / (9k + 18)
Verified step by step guidance1
Identify the rational expression given as a fraction: \(\frac{8k + 16}{9k + 18}\).
Factor out the greatest common factor (GCF) from the numerator: \$8k + 16 = 8(k + 2)$.
Factor out the greatest common factor (GCF) from the denominator: \$9k + 18 = 9(k + 2)$.
Rewrite the expression using the factored forms: \(\frac{8(k + 2)}{9(k + 2)}\).
Cancel the common factor \((k + 2)\) from numerator and denominator to simplify the expression to \(\frac{8}{9}\), assuming \(k \neq -2\) to avoid division by zero.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Factoring Polynomials
Factoring involves rewriting a polynomial as a product of its factors. For expressions like 8k + 16, factoring out the greatest common factor (GCF) simplifies the expression, making it easier to reduce rational expressions.
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Factoring
Simplifying Rational Expressions
A rational expression is simplified by dividing the numerator and denominator by their common factors. This process reduces the expression to its lowest terms, ensuring no further simplification is possible.
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Rationalizing Denominators
Greatest Common Factor (GCF)
The GCF is the largest factor shared by two or more terms. Identifying the GCF in both numerator and denominator is essential to factor and simplify rational expressions effectively.
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Factoring
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