Chapter 3: Problem 89
Given the following, \(g(x)=12 x-13,\) find \(g(-13)\)
Short Answer
Expert verified
\(g(-13) = -169\).
Step by step solution
01
Identify the Function and Input
The function given is \(g(x) = 12x - 13\). We need to evaluate this function at \(x = -13\).
02
Substitute the Input into the Function
Replace \(x\) in the function \(g(x)\) with \(-13\). This gives us \(g(-13) = 12(-13) - 13\).
03
Perform the Multiplication
Calculate the result of the multiplication: \(12 \times (-13) = -156\).
04
Solve the Expression
Using the result from Step 3, complete the expression: \(g(-13) = -156 - 13\).
05
Final Calculation
Subtract the numbers: \(-156 - 13 = -169\). Hence, \(g(-13) = -169\).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Linear Functions
Linear functions are a simple yet powerful type of function in mathematics. These functions are defined by equations of the form \(f(x) = ax + b\), where \(a\) and \(b\) are constants.
In our exercise, the function is \(g(x) = 12x - 13\), which is a classic example of a linear function. Here, \(12\) is the coefficient of \(x\), and \(-13\) is the constant term, or y-intercept.
In our exercise, the function is \(g(x) = 12x - 13\), which is a classic example of a linear function. Here, \(12\) is the coefficient of \(x\), and \(-13\) is the constant term, or y-intercept.
- The coefficient \(a = 12\) determines the slope of the line. A positive slope means the line inclines upwards, while a negative one means it declines.
- The constant \(b = -13\) shifts the entire line up or down on a graph.
Substitution
Substitution is a method used to evaluate functions at specific points. It involves replacing a variable with a given number. In our exercise, we're asked to find \(g(-13)\). This means we substitute \(-13\) in place of \(x\) in the function \(g(x)=12x-13\).
The process is as follows:
The process is as follows:
- Take the original function \(g(x) = 12x - 13\).
- Replace \(x\) with \(-13\), resulting in the expression \(g(-13) = 12(-13) - 13\).
Arithmetic Operations
Arithmetic operations refer to basic mathematical calculations such as addition, subtraction, multiplication, and division. In our step-by-step solution, we mainly perform multiplication and subtraction.
After substitution, the task requires finding \(12 \times (-13)\). Understanding multiplication of positive and negative numbers is key:
After substitution, the task requires finding \(12 \times (-13)\). Understanding multiplication of positive and negative numbers is key:
- Multiplying a positive by a negative results in a negative product: \(12 \times (-13) = -156\).
- The next step involves subtraction: \(-156 - 13\), which further decreases the number.