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Functions and Their Graphs
Honors Calculus Keeper 4
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Evaluating Functions To evaluate a function, substitute the input (the given number or expression) for the function's variable (place holder, x). Replace the x with the number or expression
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Example 1: Evaluating Functions
Given: 𝑓 𝑥 =3𝑥−5 Find: 𝑓(4)
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Example 2: Evaluating Functions
Given: 𝑓 𝑥 = 𝑥 2 +7 Find: 𝑓(3𝑎)
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Example 3: Evaluating Functions
Given: 𝑓 𝑥 = 𝑥 2 +7 Find: 𝑓(𝑏−1)
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Example 4: Evaluating Functions
Given: 𝑓 𝑥 = 𝑥 2 +7 Find: 𝑓 𝑥+ℎ −𝑓 𝑥 ℎ
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Domain
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Range
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Find the Domain and Range of the Function
𝑓 𝑥 = 𝑥−1
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Find the Domain and Range of the Function
𝑓 𝑥 =4−𝑥
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Find the Domain and Range of the Function
𝑓 𝑥 = 4 𝑥
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Find the Domain and Range of the Function
𝑓 𝑥 = 1 2 𝑥 3 +2
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Find the Domain and Range of the Function
𝑓 𝑥 = 9− 𝑥 2
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Rules for Transformation of Functions
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Piecewise Functions A function that is defined using two or more equations for different intervals of the domain is called a piecewise function.
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Evaluating Piecewise Functions
Evaluate 𝑓 𝑥 when (a) 𝑥=67 (b) 𝑥=72 and (c) 𝑥=65 𝑓 𝑥 = 1.6𝑥−41.6, 𝑖𝑓 63<𝑥<66 3𝑥−132, 𝑖𝑓 66≤𝑥≤68 2𝑥−66, 𝑖𝑓 𝑥>68
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Graphing Piecewise Functions
𝑓 𝑥 = −3𝑥+2, 𝑥≤ 𝑥−4, 𝑥>2
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Graphing Piecewise Functions
𝑓 𝑥 = 𝑥 2 −4, 𝑖𝑓 𝑥<−2 𝑥+6 , 𝑖𝑓 −2≤𝑥≤ 𝑥−5, 𝑖𝑓 𝑥>3
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Example. Write the equation for the graph shown.
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Combination of Functions
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Example 𝑓 𝑥 = 𝑥 𝑥 𝑔 𝑥 =−3𝑥+2 1. Find (𝑔⋅𝑓)(𝑥)
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Example 𝑓 𝑥 = 𝑥 𝑥 𝑔 𝑥 =−3𝑥+2 2. Find (𝑓+𝑔)(𝑥)
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Example 𝑓 𝑥 = 𝑥 𝑥 𝑔 𝑥 =−3𝑥+2 3. Find (𝑓−𝑔)(𝑥)
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Example 𝑓 𝑥 = 𝑥 𝑥 𝑔 𝑥 =−3𝑥+2 4. Find 𝑔 𝑓 (𝑥)
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Composition of Functions
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Example 𝑓 𝑥 = 𝑥 𝑥 𝑔 𝑥 =−3𝑥+2 5. Find (𝑔∘𝑓)(𝑥)
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Example 𝑓 𝑥 = 𝑥 𝑥 𝑔 𝑥 =−3𝑥+2 6. Find (𝑓∘𝑔)(𝑥)
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