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Ch. R - Review of Basic Concepts
Lial - College Algebra 13th Edition
Lial13th EditionCollege AlgebraISBN: 9780136881063당신이 사용하는 게 아니라요?교과서 변경
1장, 문제 51

Use the rules for radicals to perform the indicated operations. Assume all variable expressions represent positive real numbers. ⁵√x² • ⁵√x³

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Identify the operation: You are multiplying two fifth roots, \(\sqrt[5]{x^2}\) and \(\sqrt[5]{x^3}\).
Recall the property of radicals that allows multiplication under the same root: \(\sqrt[n]{a} \cdot \sqrt[n]{b} = \sqrt[n]{a \cdot b}\).
Apply this property to combine the radicals: \(\sqrt[5]{x^2} \cdot \sqrt[5]{x^3} = \sqrt[5]{x^2 \cdot x^3}\).
Use the laws of exponents to multiply inside the radical: \(x^2 \cdot x^3 = x^{2+3} = x^5\).
Rewrite the expression as \(\sqrt[5]{x^5}\) and recognize that the fifth root of \(x^5\) simplifies to \(x\) because \(\sqrt[5]{x^5} = x^{5/5} = x\).

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Properties of Radicals

Radicals represent roots of numbers or expressions. The nth root of a product equals the product of the nth roots, allowing multiplication under a single radical. For example, ⁿ√a × ⁿ√b = ⁿ√(a × b), which simplifies operations involving radicals with the same index.
추천 영상:
05:20
Expanding Radicals

Multiplication of Radicals with the Same Index

When multiplying radicals that have the same root index, you can combine them into one radical by multiplying their radicands. For instance, ⁵√x² × ⁵√x³ = ⁵√(x² × x³) = ⁵√x⁵, simplifying the expression efficiently.
추천 영상:
06:44
Radical Expressions with Variables

Simplifying Radicals Using Exponent Rules

Radicals can be expressed as fractional exponents, where ⁿ√x^m = x^(m/n). This allows simplification by applying exponent rules, such as adding exponents when multiplying like bases, making it easier to simplify expressions like ⁵√x⁵ = x^(5/5) = x.
추천 영상:
5:48
Adding & Subtracting Unlike Radicals by Simplifying