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Browse High School Functions
Stars indicate particularly interesting answers or
good places to begin browsing.
Selected answers to common questions:
Composition of functions.
Domain and range.
Inverse of a function.
Piecewise functions.
 Function Its Own Inverse [01/02/1998]

Show that f(x) = X/X1 is its own inverse.
 Functions [11/12/1994]

I'm a first year algebra student having difficulty learning about
functions. Exactly how do they work?
 Functions and Equations [02/10/2001]

When is an equation also a function? How do you recognize a function?
 Functions and Function Tables [05/11/1999]

I don't understand functions and function tables. Can you help me?
 Functions and Inverses [05/29/2002]

Find sets A, B, and C, and functions f:A>B and g:B>C, such that
(g o f) is both injective and surjective, but f is not surjective
and g is not injective.
 Functions: Domain, Range, and Piecewise [08/31/1998]

What are piecewise functions? What are open and closed points? How do you
figure out the domain and range of a function without graphing it on a
calculator?
 Functions of a Complex Variable [10/05/2002]

Show that w=f(z*), where z*=xiy and f is a differentiable function,
is not an analytic function of z.
 Functions of Imaginary Numbers [7/31/1996]

Does (ln i) itself exist? Where does e^iA = cos A + i sin A come from?
 Functions O(k) and Omega(k) [01/20/2001]

Please explain the difference between the functions O(k) and Omega(k).
 Functions Possible for a Symmetric, Asymptotic Graph [02/02/2013]

A student seeks an even function that would represent a graph with a horizontal
asymptote and symmetry around the yaxis. Doctor Peterson suggests considering
functions of the form 1/f(x) — or graphing f(x) by finding 1/y for every x.
 Functions that are their own inverses [02/28/1998]

Can a function ever be its own inverse?
 Functions: The Very Idea [04/08/2014]

A teen struggles to grasp what constitutes a function, and to reconcile the uniqueness
of two functions that differ in notationally or computationally trivial ways. Doctor
Peterson offers perspectives both abstract and concrete.
 Functions Without a Second Derivative [6/28/1996]

What are some examples of functions of a real variable whose derivatives
don't have derivatives?
 The Gamma Function and Its Derivative [05/26/1998]

Does n! = the integral from 0 to infinity of (x^n)(e^x)dx hold true for
all real numbers? If so, can we find the derivative of n!?
 General Strategy for Questions on Functions [06/10/2004]

If the function f satisfies the equation f(x + y) = f(x) + f(y) for
every pair of real numbers x and y, what is (are) the possible
value(s) of f(0)?
 Graphing Absolute Values [07/03/2002]

I have a function, f(x), that I can graph, but I don't understand how
to graph f(x).
 Graphing f(2x) and f(x) [09/03/2003]

Given f(x), how do you graph f(2x) and f(x)?
 Graphing Limits [09/12/2001]

I was hoping you could explain the concept of "limits" and how to read
them from graphs.
 Graphing Piecewise Functions [09/09/2001]

I do not understand how to graph piecewise functions.
 Graphing Polynomial Functions in Factored Form [07/07/2004]

When graphing polynomial functions, why do factors of even
multiplicity cause the graph to not cross the xaxis, while factors of
odd multiplicity cause it to cross?
 Graphing Rational Functions and Vertical Asymptotes [03/28/2008]

When working with rational functions such as y = (x5)/(x3), how do
you know if the graph curves up or down at the vertical asymptote?
 Graphing Reciprocal Functions [11/01/2001]

I know what a reciprocal is, but I don't know how to graph it.
 Graphing Sin and Cosine Functions [5/24/1996]

I really need some help in finding the graphs of the following
functions...
 Graphing the Absolute Value/Square Root of a Function [07/26/2002]

Can you illustrate and discuss how taking the absolute value or the
square root of a function affects the graph of the function?
 Graphing Two Functions With One Equation [10/21/2003]

I have a question on graphing functions. I am just wondering if it is
possible to use one equation to graph two functions?
 Graphing Two Functions with One Equation? [10/21/2003]

Suppose I have two functions, like y = sqrt(x)  4 and y = sqrt(x) 
8. Is there a single equation that would produce the same graph as
the two functions graphed together?
 Graph of Circle as a Function [05/30/1998]

The graph of a circle is not a function because it fails the vertical
line test. How could you make it a function?
 Graphs of Inverse Functions [07/25/2002]

Explain why, if y=f(x) and y=g(x) are inverses, the graph of either
function is the graph of the other reflected across the line y=x.
 Graphs of Step Functions [11/29/2003]

Why do some graphs move in steps rather than smooth lines? What causes
that?
 Graph with f(x) [10/17/2001]

Sketch the equations: y = f(x)+ 2; y = f(x3); y = 2f(x).
 Greatest Integer Equation [08/06/2003]

I am trying to correctly interpret [[x]]^2 + [[y]]^2 = 1, where f(x)=
[[x]], is the Greatest Integer function.
 Greatest Integer Function [12/04/2002]

How can I explain greatest integer function to my homeschooled son?
 Greatest Integer Functions [09/27/1998]

Can you help me solve for the graph of [y]=[x], where [] is the greatest
integer function?
 The Heaviside Step Function [09/03/2003]

How can I construct a term that is zero when the input is below some
limit, but nonzero above it?
 How Are Functions and Expressions Related? [07/09/2004]

What is the relationship between a function and an expression? I
don't see any relationship, they are two completely different things.
 How to Evaluate 4!!!! [10/16/2003]

Our Calculus 2 teacher has challenged us to find the exact value for
4!!!!, but the number is too large to reasonably calculate by hand.
 How to Find the Range of a Function [02/25/1998]

How do you find the range of a function like g(x) = (x+1)/(x^21)?
 How to Solve Equations with No Analytic Solution Method [10/26/2005]

A discussion of solving equations that can't be solved analytically by
using iterative estimation methods including bisection, false
position, and Newton's method. The equation x(e^x) = 3 is used as an
example.
 Hyperbolic Functions [06/27/1998]

What does the inverse of sinh or cosh mean?
 Hyperbolic Functions [10/14/1998]

Can you explain hyperbolic functions? How are they defined? How do you
evaluate them?
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