Function Operations Overview

Questions and Answers

What is the result of the function addition operation for the functions defined as $f(x) = 2x + 3$ and $g(x) = x^2$?

$2x^2 + 3$

$x^2 + 2x + 3$ (correct)

$x^2 - 2x + 3$

$2x + 3 + x^2$

Given the functions $f(x) = 3x + 5$ and $g(x) = x^2$, what is the result of the function subtraction operation?

$3x + 5 - x^2$

$-3x + 5 + x^2$

$-x^2 + 3x + 5$ (correct)

$3x - x^2 - 5$

What is the result of dividing the functions $f(x) = x^2 + 1$ and $g(x) = x - 2$?

$rac{x^2 + 1}{x - 2}$ (correct)

$rac{x^2 + 1}{x + 2}$

$rac{x + 1}{x - 2}$

$rac{x^2 - 2}{x^2 + 1}$

What does the composition of functions $f(g(x))$ represent?

Applying $g(x)$ first, then $f(x)$ Signup and view all the answers

What is the multiplication result of the functions $f(x) = x + 1$ and $g(x) = 2x$?

$2x^2 + 2x$ Signup and view all the answers

Which operation would yield a new function with the input $f(x)$ and $g(x)$ defined as before, $h(x) = f(x) imes g(x)$?

Function multiplication Signup and view all the answers

If $f(x) = 2x+3$ and $g(x) = x^2$, what is $(f eather g)(x)$?

$x^2 + 2x + 3$ Signup and view all the answers

What is necessary to remember when performing function division which involves $g(x)$?

$g(x)$ must be non-zero$ Signup and view all the answers

Study Notes

Function Operations Overview

Function operations involve combining two or more functions through addition, subtraction, multiplication, and division.

Function Addition

Defined as: ( (f + g)(x) = f(x) + g(x) )
The sum of two functions produces a new function.
Example:
- Let ( f(x) = 2x + 3 ) and ( g(x) = x^2 ).
- Then, ( (f + g)(x) = (2x + 3) + (x^2) = x^2 + 2x + 3 ).

Function Subtraction

Defined as: ( (f - g)(x) = f(x) - g(x) )
The difference of two functions gives a new function.
Example:
- Let ( f(x) = 3x + 5 ) and ( g(x) = x^2 ).
- Then, ( (f - g)(x) = (3x + 5) - (x^2) = -x^2 + 3x + 5 ).

Function Multiplication

Defined as: ( (f \cdot g)(x) = f(x) \times g(x) )
The product of two functions results in a new function.
Example:
- Let ( f(x) = x + 1 ) and ( g(x) = 2x ).
- Then, ( (f \cdot g)(x) = (x + 1)(2x) = 2x^2 + 2x ).

Function Division

Defined as: ( \left(\frac{f}{g}\right)(x) = \frac{f(x)}{g(x)} ) (where ( g(x) \neq 0 ))
The quotient of two functions results in a new function, subject to the domain restriction where ( g(x) \neq 0 ).
Example:
- Let ( f(x) = x^2 + 1 ) and ( g(x) = x - 2 ).
- Then, ( \left(\frac{f}{g}\right)(x) = \frac{x^2 + 1}{x - 2} ).

Composition of Functions

Defined as: ( (f \circ g)(x) = f(g(x)) )
Composition allows one function to be applied inside another.
Example:
- Let ( f(x) = x + 1 ) and ( g(x) = 2x ).
- Then, ( (f \circ g)(x) = f(g(x)) = f(2x) = 2x + 1 ).

Key Points

Each operation produces a new function based on the inputs from the original functions.
Understanding the domain is crucial, especially in division and composition, to avoid undefined expressions.
Function operations can be graphically represented and analyzed for insights into their behavior and intersections.

Function Operations Overview

Function operations unify multiple functions through addition, subtraction, multiplication, and division to create new functions.

Function Addition

Addition of functions follows the rule: ( (f + g)(x) = f(x) + g(x) ).
Example:
- For ( f(x) = 2x + 3 ) and ( g(x) = x^2 ), the resulting function is ( (f + g)(x) = x^2 + 2x + 3 ).

Function Subtraction

Subtraction of functions is expressed as: ( (f - g)(x) = f(x) - g(x) ).
Example:
- With ( f(x) = 3x + 5 ) and ( g(x) = x^2 ), the outcome is ( (f - g)(x) = -x^2 + 3x + 5 ).

Function Multiplication

Multiplication operates under the definition: ( (f \cdot g)(x) = f(x) \times g(x) ).
Example:
- If ( f(x) = x + 1 ) and ( g(x) = 2x ), then ( (f \cdot g)(x) = 2x^2 + 2x ).

Function Division

Division of functions is formulated as: ( \left(\frac{f}{g}\right)(x) = \frac{f(x)}{g(x)} ) with the condition ( g(x) \neq 0 ).
Example:
- For ( f(x) = x^2 + 1 ) and ( g(x) = x - 2 ), the division yields ( \left(\frac{f}{g}\right)(x) = \frac{x^2 + 1}{x - 2} ).

Composition of Functions

Composition is given by: ( (f \circ g)(x) = f(g(x)) ).
Example:
- With ( f(x) = x + 1 ) and ( g(x) = 2x ), the composition results in ( (f \circ g)(x) = 2x + 1 ).

Key Points

Each operation creates a new function influenced by the initial functions' outputs.
Awareness of domain restrictions is essential, particularly in division and composition, to prevent undefined results.
Function behaviors, relationships, and intersections can be visualized through graphs, providing insightful analyses.

Description

This quiz explores the fundamental operations of functions including addition, subtraction, multiplication, and division. Each operation is defined with clear examples to illustrate the concept of combining functions to produce new functions. Test your understanding of these essential mathematical operations!