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91Ó°ÊÓ

Use the definition of exponents as indicating repeated multiplication to simplify each of the following expressions. [Examples \(4-12\) ] $$8^{2}$$

Short Answer

Expert verified
The expression \(8^2\) simplifies to \(64\).

Step by step solution

01

Identify the Base and Exponent

In the expression \(8^2\), the base is \(8\) and the exponent is \(2\). The base is the number that will be multiplied, and the exponent tells us how many times it will be multiplied.
02

Write the Expression as Repeated Multiplication

Using the definition of exponents, \(8^2\) means we multiply \(8\) by itself 2 times. So, we write it as \(8 \times 8\).
03

Perform the Multiplication

Calculate \(8 \times 8\). This equals \(64\).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Base and Exponent
Understanding the terms "base" and "exponent" is crucial when dealing with exponents. In a mathematical expression like \(8^2\), the base is the number that is being multiplied. Here, that number is \(8\). Think of it as the "main ingredient" in a recipe, without which nothing else can happen. The exponent, on the other hand, is the small number written as a superscript, here it's \(2\). This tells us "how many times" the base, \(8\), will multiply itself.
  • **Base**: The main number in the expression. It's the number you see on the "ground level."
  • **Exponent**: The small number written at the top right. It indicates the number of times the base is used in multiplication.

In the example \(8^2\), the base \(8\) will be multiplied by itself exactly two times. It's like giving someone a specific number of instructions: "Compute this, and do it exactly twice!" Understanding this is key to moving forward and solving expressions with exponents.
Repeated Multiplication
When we see an exponent, it’s a shortcut for repeated multiplication. The exponent shows us how many times we multiply the base by itself. For \(8^2\), imagine you’ve been handed a task: multiply \(8\) by itself, twice. Here’s how you would write that:
\[8^2 = 8 \times 8\]
This transforms the expression into a multiplication problem. Repeated multiplication helps simplify longer problems, where calculating manually may be complicated.
  • **Repetition**: Doing the same multiplication step more than once.
  • **Efficiency**: Speeds up calculations by using one number and an exponent, rather than writing out each term.

This concept is powerful because it allows mathematicians to write and handle very large numbers compactly and consistently.
Simplifying Expressions
The ultimate goal of using exponents is to simplify mathematical expressions. Once we've rewritten the problem using repeated multiplication (as in \(8 \times 8\)), we carry out the operation to find the solution. This final step reduces the expression to a single number, making it much simpler to understand. Here’s how it looks:
1. Write out the repeated multiplication: \(8 \times 8\).
2. Perform the multiplication: calculate to find \(8 \times 8 = 64\).
By calculating, you reduce "\(8^2\)" to just "\(64\)".
  • **Simplifying**: Finding a single, most reduced form of the expression.
  • **Understanding**: Makes lengthy or complex expressions digestible and clear.

"Simplifying" doesn’t stop here. It’s crucial for tackling larger problems, helping to align different operations into a clean, concise outcome.

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