Ch. R - Review of Basic Concepts

Lial13th EditionCollege AlgebraISBN: 9780136881063Not the one you use?Change textbook

Lial 13th Edition

Ch. R - Review of Basic Concepts

Problem 14

Chapter 1, Problem 14

Write each root using exponents and evaluate. ∜256

Verified step by step guidance

Recognize that the symbol ∜ represents the fourth root of a number, so ∜256 means \(256^{\frac{1}{4}}\).

Rewrite the expression using exponents: \(\sqrt[4]{256} = 256^{\frac{1}{4}}\).

Express 256 as a power of a smaller base. Since \(256 = 2^8\), rewrite the expression as \(\left(2^8\right)^{\frac{1}{4}}\).

Use the power of a power property of exponents: \(\left(a^m\right)^n = a^{m \times n}\), so \(\left(2^8\right)^{\frac{1}{4}} = 2^{8 \times \frac{1}{4}}\).

Multiply the exponents: \(8 \times \frac{1}{4} = 2\), so the expression simplifies to \(2^2\), which can then be evaluated further if needed.

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Key Concepts

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

Radicals and Roots

Radicals represent roots of numbers, such as square roots or fourth roots. The symbol ∜ denotes the fourth root, meaning the number that, when raised to the power of 4, equals the given value. Understanding how to interpret and work with roots is essential for solving such problems.

Exponential Notation for Roots

Roots can be expressed using fractional exponents, where the nth root of a number is written as that number raised to the power of 1/n. For example, the fourth root of 256 can be written as 256^(1/4). This notation allows the use of exponent rules to simplify and evaluate roots.

Evaluating Powers and Roots

Evaluating roots involves finding a number that, when raised to a specific power, equals the original number. For 256^(1/4), you find a number x such that x^4 = 256. Recognizing perfect powers and using prime factorization can help simplify and compute the value efficiently.

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