Problem 7 - College Algebra

Question

Evaluate each exponential expression in Exercises 1–22. $$ (-3)^{0} $$

Step-by-Step Solution

Answer

The value of \((-3)^{0}\) is 1.

Step 1: Identify the Expression

We need to evaluate or simplify: \((-3)^{0}\).

Step 2: Apply Order of Operations

Following the order of operations (PEMDAS/BODMAS), we simplify the expression step by step, handling parentheses, exponents, multiplication/division, then addition/subtraction.

Step 3: Compute the Result

Carrying out the operations systematically, we arrive at the result.

Step 4: State the Result

The value of \((-3)^{0}\) is 1.

Key Concepts

Zero-exponent Rule

The zero-exponent rule is one of the most fundamental principles in the realm of exponential expressions. This rule states that any non-zero base raised to the power of zero is equal to one. It doesn't matter what the base is, as long as it is not zero. For example,

• Consider the expression \((-3)^{0}\). According to the zero-exponent rule, the value will be 1.
• This rule applies to any number or variable, such as \(a^{0} = 1\) for any \(a eq 0\).

The rationale behind this rule can be traced back to the property of exponents, which involves dividing powers with the same base. For instance, when you have \(a^{n}/a^{n} = a^{n-n} = a^{0}\), it simplifies to 1, as any number divided by itself equals 1.
Understanding the zero-exponent rule helps simplify complex problems, providing a straightforward solution to what might initially seem perplexing.

Evaluation of Expressions

Evaluating expressions, particularly exponential ones, is vital in mathematics as it helps us understand the behavior and outcome of equations. When faced with evaluating an exponential expression, the first step is to carefully identify the base and the exponent.
For instance, when evaluating \((-3)^{0}\), we apply the zero-exponent rule. The expression evaluates to 1, as explained previously.

• This step-by-step evaluation allows us to simplify the problem and confirm that each component of the expression is correctly addressed.
• Being systematic in evaluating these expressions can increase accuracy and enable a deeper understanding of more complex problems later.

Evaluation is not just about calculating; it's about comprehending the underlying principles, ensuring that each part of the equation adheres to the rules of mathematics.

Exponential Functions

Exponential functions represent expressions in the form \(f(x) = a^x\), where \(a\) is a constant, and \(x\) is the exponent variable. These functions appear frequently in various scientific and mathematical disciplines because they model exponential growth and decay.
A unique feature of exponential functions is that the rate of change increases (or decreases) faster than linear or polynomial functions as \(x\) changes.

• For positive bases greater than 1, the function displays exponential growth, meaning it increases rapidly.
• If the base is a fraction between 0 and 1, it shows exponential decay, decreasing swiftly.

Understanding how different bases and exponents affect the overall behavior of an expression can be crucial in fields such as finance for compound interest calculations or in biology for modeling population growth.
By mastering exponential expressions and their evaluation, you lay the groundwork for confidently tackling more advanced concepts and applications involving exponential functions.