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Ch. P - Fundamental Concepts of Algebra
Blitzer - College Algebra 8th Edition
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Tutti i libri di testoBlitzer 8th EditionCh. P - Fundamental Concepts of AlgebraProblema 102
Capitolo 1, Problema 102

Simplify by reducing the index of the radical. 724\(\sqrt\)[4]{7^2}

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Identify the expression inside the radical: the fourth root of \(7^2\), which can be written as \(\sqrt[4]{7^2}\).
Recall the property of radicals and exponents: \(\sqrt[n]{a^m} = a^{\frac{m}{n}}\). Apply this to rewrite the expression as \(7^{\frac{2}{4}}\).
Simplify the fraction in the exponent: \(\frac{2}{4} = \frac{1}{2}\), so the expression becomes \(7^{\frac{1}{2}}\).
Recognize that \(7^{\frac{1}{2}}\) is equivalent to the square root of 7, or \(\sqrt{7}\).
Thus, the simplified form of \(\sqrt[4]{7^2}\) is \(\sqrt{7}\).

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Radical Expressions and Indices

A radical expression involves roots, such as square roots or fourth roots, indicated by an index. The index shows the degree of the root, for example, the fourth root (⁴√) means the number raised to the 1/4 power. Understanding how to interpret and manipulate these indices is essential for simplifying radicals.
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Radical Expressions with Fractions

Reducing the Index of a Radical

Reducing the index means rewriting a radical with a smaller root index or converting it into an equivalent expression with fractional exponents. This often involves expressing the radicand with powers that allow simplification, such as rewriting ⁴√(7²) as 7^(2/4) and then simplifying the fraction.
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Expanding Radicals

Fractional Exponents and Simplification

Fractional exponents represent roots and powers simultaneously, where a^(m/n) equals the nth root of a raised to the mth power. Simplifying expressions with fractional exponents involves reducing the fraction and rewriting the expression in simplest form, which helps in reducing the index of radicals effectively.
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Rational Exponents
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