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NOTES Section 2.6 : Special Functions
Definition Step Function: A function whose graph is a series of line segments.
this symbol means the greatest integer less than or equal to x. Reminder integers are …-2, -1, 0, 1, 2…Ex. = _____ = ______
EX 1. f(x) = ST1. f (x) =
Domain_____________ Domain_______________
Range_______________ Range_________________
Constant Function: A linear function of the form f(x) = b , same as y = #. (Graph is a Horizontal lineEX2. f(x) = 2 ST2. f(x) = -4
Domain______________ Domain_______________
Range________________ Range_________________
x f(x) x f(x)
Identity Function: Is in the form f(x) = x The graph goes through the origin (0,0)
EX3. f(x) = x
Domain______________
Range_______________Absolute Value Function : Is a function written as f(x) =
(Graph looks like a V shape)
EX4. f(x) = ST4. f(x) = Domain__________
Range____________Domain_____________
Range_______________
Piecewise Function: A function that is written using two or more expressions.
x f(x)
x f(x) x f(x)
EX 5. f(x) = x- 4 if x < 21 if x > 2
Domain__________
Range____________
x f(x) x f(x)