Question

Write \(\frac{1}{x^{-1 / 2}}\) using a positive index.

Short answer

Question: Rewrite the expression with a positive exponent: \(\frac{1}{x^{-1/2}}\) Answer: \(x^{1/2}\)

Step-by-step solution

Identify the negative exponent

In the given expression, \(\frac{1}{x^{-1/2}}\), the negative exponent is \(-1/2\). Step 2: Apply the rule for negative exponents

Apply the rule for negative exponents

We know that \(\frac{1}{x^{-n}} = x^n\). Here, \(n=-1/2\). So, applying this rule, we get: \(\frac{1}{x^{-1/2}} = x^{1/2}\). So, the expression with a positive index is:

Final Answer

\(\frac{1}{x^{-1 / 2}} = x^{1/2}\).

Key concepts

Exponent Rules

Exponent rules are essential for simplifying algebraic expressions. They help us understand how to manipulate bases and exponents efficiently. When dealing with negative exponents, it is important to know that they signify the reciprocal of a number raised to a positive exponent. The rule can be stated as: if we have a negative exponent \(-n\), the expression \(a^{-n}\) becomes \(\frac{1}{a^n}\). Conversely, \(\frac{1}{a^{-n}}\) simplifies to \(a^n\).

In the example \(\frac{1}{x^{-1/2}}\), the negative exponent is \(-1/2\). By applying the rule, we change the sign and flip the expression, resulting in the simplified form \(x^{1/2}\), which uses a positive index. This application of the exponent rule makes complex expressions easier to handle, particularly in algebraic manipulation.

Algebraic Manipulation

Algebraic manipulation involves rearranging and simplifying mathematical expressions to make them more workable. One of the essential skills in algebraic manipulation is converting expressions with negative exponents into ones with positive indices. This helps in simplifying calculations and understanding the structure of an expression more clearly.

For instance, transforming \(\frac{1}{x^{-1/2}}\) into \(x^{1/2}\) through exponent rules is a classic example of algebraic manipulation. The process eliminates the fraction and negative exponent, presenting a clearer view of the expression which makes further algebraic operations, such as addition, subtraction, or multiplication, simpler.

Knowing how to manipulate expressions is crucial for progressing in more advanced areas of mathematics, where complex expressions are a common hurdle.

Mathematical Expressions

Mathematical expressions are combinations of numbers, variables, and operations that stand for a particular number or quantity. They can be simple, like \(x^2\), or complex, involving multiple operations and variables. Understanding how to work with expressions is a foundational skill in mathematics.

When faced with an expression like \(\frac{1}{x^{-1/2}}\), recognizing patterns and rules, such as those involving exponents, simplifies the task of rewriting it effectively. A primary goal in simplifying expressions is to present them in a form that is easy to interpret and compute. By using algebraic manipulation to transform it into \(x^{1/2}\), we streamline the expression, which is key in problem-solving.

This skill not only aids in mathematics classwork but also in real-world applications where presenting information clearly and logically is essential.