Problem 101 - College Algebra Essentials

Question

In Exercises \(101-108\), simplify by reducing the index of the radical. $$\sqrt[4]{5^{2}}$$

Step-by-Step Solution

Answer

The simplified form of \(\sqrt[4]{5^{2}}\) is \(\sqrt{5}\)

Step 1: Understanding the radical

First, understand the numerical value under the radical and the current degree of the radical. Here, it is the fourth root of 5 squared, which is written as \(\sqrt[4]{5^{2}}\)

Step 2: Applying the rule of exponents

Next, apply the rule of exponents that states the process of raising a power to a power is simply done by multiplying the exponents. Therefore, raising 5 to the power of 2 and then to the power of 1/4 can be simplified by multiplying the exponents together 2*(1/4) = 1/2.

Step 3: Final Simplification

Finally, since 5 to the power of 1/2 is the square root of 5, the simplified expression is \(\sqrt{5}\)

Key Concepts

Radical Expressions

Radical expressions, often referred to as roots or surds, are mathematical expressions that feature a number or an algebraic term underneath a radical sign. The most common radical is the square root, but radical expressions can involve any root, such as cube roots or fourth roots. Simplification of these expressions is a foundational skill in algebra.

As seen in the exercise \(\sqrt[4]{5^{2}}\), students were tasked with simplifying a radical that had an exponent applied to its radicand (the number within the radical). The key to simplifying such an expression lies in understanding the interplay between radicals and exponents. The goal is to express the radical in its simplest form, which can sometimes mean removing the radical altogether or reducing its index, the number that indicates the degree of the root.

Exponents and Radicals

Exponents and radicals are inextricably linked through their operations and properties. An exponent represents repeated multiplication, while a radical denotes the root of a number. The exercise \(\sqrt[4]{5^{2}}\) demonstrates the relationship between them: raising a number to an exponent and then taking a root effectively 'undoes' part of the exponentiation.

The general rule for combining exponents and radicals is that when you raise a power to a power, you multiply the exponents (in this case, \(2\) and \(1/4\)). The expression becomes \(5^{2 \cdot 1/4} = 5^{1/2}\), which simplifies to the square root of 5. This rule simplifies complex radical expressions by turning them into expressions with rational exponents, making further simplification or computation far more manageable.

Algebraic Simplification

Algebraic simplification is the process of reducing an algebraic expression to its simplest form. This can involve a variety of operations, such as factoring, distributing, combining like terms, and, as in our example, simplifying radicals. The goal is to make the expression as concise and as easy to work with as possible.

In simplifying the fourth root of \(5^{2}\), the solution illustrates how understanding the properties of exponents and radicals can lead to a straightforward algebraic simplification. Re-writing an exponent as a radical and vice versa often exposes new avenues for simplification. Therefore, it is crucial to have a strong grasp of these rules to tackle a variety of algebraic problems. Simplifying expressions not only helps to find the solution to algebra problems but also aids in understanding the underlying mathematical relationships and patterns.