Precalculus Unit 2: Functions 1st
Semester Questions And Answers
Latest Update
function
- a relation in which, for each number in the domain, there corresponds one
and only one number in the range
- also known as a set of ordered pairs in which no two pairs have the same first
element.
independent variable
The variable representing the element in the domain of the function that is not
affected by the function (input)
- often represented by x and t
dependent variable
the variable representing elements in the range of the function that is affected
by the function (output)
- often represented by y and s
functional notation
an equation of y in terms of x can be rewritten so that y=f(x)
, piecewise defined functions
a function that is written using two or more expressions
graph of a function
the collection of ordered pairs (x,f(x)) such that x is the domain of f
identity function
f(x) = x
f(a) = a for every real number a
constant function
f(x) = c
c is constant, and the value of the function is the same for every domain
the graph is a straight horizontal line
absolute value function
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