Table of contents
- 0. Review of College Algebra4h 43m
- 1. Measuring Angles39m
- 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
2:21 minutes
Problem 25b
Textbook Question
Textbook QuestionWrite each rational expression in lowest terms. See Example 2. 8k + 16 9k + 18
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Rational Expressions
Rational expressions are fractions where the numerator and the denominator are both polynomials. To simplify these expressions, one must factor both the numerator and the denominator to identify common factors that can be canceled out. Understanding how to manipulate polynomials is essential for working with rational expressions.
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Rationalizing Denominators
Factoring Polynomials
Factoring polynomials involves rewriting a polynomial as a product of its factors. This process is crucial for simplifying rational expressions, as it allows for the identification of common factors in the numerator and denominator. Techniques such as factoring out the greatest common factor (GCF) or using special products (like the difference of squares) are commonly employed.
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Factoring
Lowest Terms
A rational expression is said to be in lowest terms when the numerator and denominator have no common factors other than 1. To achieve this, one must fully factor both parts and cancel any common factors. This simplification is important for clarity and accuracy in mathematical expressions, ensuring that the expression is as simple as possible.
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