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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1:26 minutes

Problem 16

Textbook Question

Write each root using exponents and evaluate. ∛-343

Verified step by step guidance

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

Rewrite the expression using exponents: \( (-343)^{1/3} \).

Recognize that \(-343\) is a negative number, and the cube root of a negative number is also negative.

Find the cube root of the absolute value of \(-343\), which is \(343\).

Determine the cube root of \(343\) by finding a number that, when multiplied by itself three times, equals \(343\).

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Key Concepts

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

Roots and Exponents

Roots and exponents are fundamental concepts in algebra that describe the relationship between numbers. The nth root of a number is a value that, when raised to the nth power, gives the original number. For example, the cube root (∛) of a number x is expressed as x^(1/3). Understanding how to convert between roots and exponents is essential for simplifying expressions and solving equations.

Negative Numbers and Roots

When dealing with roots, particularly odd roots like the cube root, negative numbers can yield real results. For instance, the cube root of -343 is -7, since (-7)³ = -343. This contrasts with even roots, where the root of a negative number is not a real number. Recognizing how negative values interact with roots is crucial for accurate evaluations.

Evaluating Expressions

Evaluating expressions involves substituting values into mathematical expressions and simplifying them to find a numerical result. In the context of roots, this means calculating the value of the root expression after converting it to its exponential form. Mastery of this concept allows students to solve problems efficiently and accurately, ensuring they can handle various algebraic expressions.