Chapter 1: Problem 28
Evaluate by hand. $$ 5-(-4)^{3}-(4)^{3} $$
Short Answer
Expert verified
The value of the expression is 5.
Step by step solution
01
Evaluate the Exponents
First, we need to calculate the exponents \((-4)^{3}\) and \(4^{3}\). Calculate: \((-4)^{3} = (-4) \times (-4) \times (-4) = -64\), Calculate: \(4^{3} = 4 \times 4 \times 4 = 64\).
02
Write the Expression with Calculated Exponents
Substitute the calculated values into the original expression. The expression becomes \(5 - (-64) - 64\).
03
Simplify the Expression
Simplify the expression step-by-step as follows:\(5 - (-64) = 5 + 64 = 69\).Now the expression is \(69 - 64\).
04
Complete the Calculation
Subtract 64 from 69:\(69 - 64 = 5\).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Exponents
Exponents are a fundamental concept in algebra that indicate how many times a number, known as the base, is multiplied by itself. In simpler terms, if we have the expression \(a^n\), it means \(a\) is multiplied by itself \(n\) times. Understanding and evaluating exponents is crucial for simplifying various mathematical expressions.
Let's take an example from the exercise:
Let's take an example from the exercise:
- \((-4)^3\): Here, \(-4\) is the base and \(3\) is the exponent. So you multiply \(-4\) three times: \((-4) \times (-4) \times (-4) = -64\).
- \(4^3\): In this case, \(4\) is the base and \(3\) is the exponent. This results in \(4 \times 4 \times 4 = 64\).
Simplifying Expressions
Simplifying expressions means reducing them to their simplest form without changing their value. This often involves combining like terms and performing operations in a specific order to make expressions easier to understand and solve.
In our example, once the exponents are evaluated, the expression becomes simpler and easier to handle:
In our example, once the exponents are evaluated, the expression becomes simpler and easier to handle:
- The expression from the exercise becomes \(5 - (-64) - 64\).
- The next step is to simplify by handling the subtraction of a negative number, which turns into addition; thus, \(5 - (-64)\) becomes \(5 + 64 = 69\).
- Now, the expression is further reduced to \(69 - 64\).
Arithmetic Operations
Arithmetic operations are basic mathematical calculations which include addition, subtraction, multiplication, and division. Each of these operations follows a specific set of rules and can often be used in combination to solve more complex problems.
In our exercise, we performed a few simple arithmetic operations to resolve the final expression:
In our exercise, we performed a few simple arithmetic operations to resolve the final expression:
- First, dealt with adding: \(5 + 64 = 69\).
- Then, used subtraction: \(69 - 64 = 5\).