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Published byBonnie Madeline Henry Modified over 9 years ago
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8.6 Algebra and Composition of Functions
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that limit the domain of a function are: The most common rules of algebra Rule 1: You can’t divide by 0. Rule 2: You can’t take the square root of a negative number.
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Basic function operations Sum Difference Product Quotient
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Example 1 Find each function and state its domain: ( f + g )( x ) ( f – g )( x ) ( f ∙ g )( x ) ( f /g )( x )
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Find each function and state its domain:
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What is the “composition of functions”?
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Function Machine x Function Machine g f
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Composition of functions 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.
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Example 3 Evaluate and : You can see that function composition is not commutative!
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(Since a radicand can’t be negative in the set of real numbers, x must be greater than or equal to zero.) Example 4 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.)
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Summary… Function arithmetic – add the functions (subtract, etc) Addition Subtraction Multiplication Division Function composition Perform function in innermost parentheses first!
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