Table of contents

0. Review of Algebra4h 16m
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 19m
10. Combinatorics & Probability1h 45m

0. Review of Algebra

Radical Expressions

College Algebra

0. Review of Algebra

Radical Expressions

1:22 minutes

Problem 71a

Textbook Question

In Exercises 59–76, find the indicated root, or state that the expression is not a real number. ___ −⁴√256

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Key Concepts

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

Radical Expressions

Radical expressions involve roots, such as square roots or fourth roots, which represent the inverse operation of exponentiation. For example, the square root of a number 'x' is a value that, when squared, gives 'x'. Understanding how to manipulate and simplify these expressions is crucial for solving problems involving roots.

Even and Odd Roots

Even roots, like the square root or fourth root, can yield both positive and negative results, but they are typically defined to return only the non-negative root in real numbers. In contrast, odd roots, such as cube roots, can yield negative results. Recognizing the distinction between even and odd roots is essential for determining the nature of the solutions.

Real Numbers

Real numbers include all the rational and irrational numbers that can be found on the number line. When evaluating roots, it is important to determine whether the result is a real number. For instance, the fourth root of a positive number is always a real number, while the fourth root of a negative number is not, as it does not exist within the real number system.