Acc Math 2 Today’s Question: How do you perform operations with functions? Standard: MM2A5.d.

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Presentation transcript:

Acc Math 2 Today’s Question: How do you perform operations with functions? Standard: MM2A5.d

Lesson 4.2 Operations with Functions

Objective  To define the sum, difference, product, and quotient of functions.  To form and evaluate composite functions.  To determine the domain for composite functions.

Basic function operations  Sum  Difference  Product  Quotient

Function, domain, & range  The domain of a function is the set of all input values (x-values)  The range of a function is the set of all output values (y values)  A relation is a function if all values of the domain are unique (they do not repeat).  A test to see if a relation is a function is the vertical line test.  If it is possible to draw a vertical line and cross the graph of a relation in more than one point, the relation is not a function.

Example 1  Find each function and state its domain:  f + g  f – g  f ·g  f / g

Example 2  Find each function and state its domain:  f ·g  f / g

Your Turn  Find each function and state its domain:  f + g  f – g  f ·g  f / g

Composition of functions  Composition of functions is the successive application of the functions in a specific order.  Given two functions f and g, the composite function is defined by and is read “f of g of x.”  The domain of is the set of elements x in the domain of g such that g(x) is in the domain of f.  Another way to say that is to say that “the range of function g must be in the domain of function f.”

Example 1  Evaluate and :  You can see that function composition is not commutative!

Example 2  Evaluate and :  Again, not the same function. What is the domain???

(Since a radicand can’t be negative in the set of real numbers, x must be greater than or equal to zero.) Example 3  Find the domain of and :  (Since a radicand can’t be negative in the set of real numbers, x – 1 must be greater than or equal to zero.)

Your turn  Evaluate and : 

Example 4  Find the indicated values for the following functions if: 

Summary…  Function arithmetic – add the functions (subtract, etc)  Addition  Subtraction  Multiplication  Division  Function composition  Perform function in innermost parentheses first  Domain of “main” function must include range of “inner” function