Table of contents

0. Review of Algebra4h 18m
1. Equations & Inequalities3h 18m
2. Graphs of Equations43m
3. Functions2h 17m
4. Polynomial Functions1h 44m
5. Rational Functions1h 23m
6. Exponential & Logarithmic Functions2h 28m
7. Systems of Equations & Matrices4h 6m
8. Conic Sections2h 23m
9. Sequences, Series, & Induction1h 22m
10. Combinatorics & Probability1h 45m

0. Review of Algebra

Radical Expressions

College Algebra

0. Review of Algebra

Radical Expressions

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1:04 minutes

Problem 22

Textbook Question

Write each root using exponents and evaluate. - ∛-343

Verified step by step guidance

Identify the expression: \(-\sqrt[3]{-343}\).

Recognize that \(-343\) can be rewritten as \(-1 \times 343\).

Express \(343\) as a power of 7: \(343 = 7^3\).

Rewrite the expression using exponents: \(-\sqrt[3]{-1 \times 7^3}\).

Apply the property of cube roots: \(-\sqrt[3]{-1} \times \sqrt[3]{7^3}\).

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Radicals

Radicals are expressions that involve roots, such as square roots or cube roots. The notation ∛x represents the cube root of x, which is the value that, when multiplied by itself three times, gives x. Understanding how to manipulate and simplify radical expressions is essential for solving problems involving roots.

Negative Numbers and Roots

When dealing with negative numbers under a radical, it's important to recognize how roots behave. For instance, the cube root of a negative number, like -343, is defined and results in a negative value. This is because multiplying three negative numbers yields a negative product, which is crucial for evaluating expressions involving negative roots.

Exponential Notation

Exponential notation is a way to express repeated multiplication of a number. For example, the cube root can be expressed using exponents as x^(1/3). This notation is useful for simplifying calculations and understanding the relationship between roots and powers, especially when evaluating expressions like ∛-343.