Graph of piecewise functions, Algebra

We should graph a couple of these to make sure that we can graph them as well.

Example: Sketch the graph of the following piecewise function.

899_Graph of piecewise functions.png


Now while we are graphing piecewise functions we are in fact graphing various functions at once, except we are just going to graph them on very particular intervals.  In this case we will be graphing the given two functions,

- x2 + 4           on x < 1

2 x -1  on x ≥ 1

We'll have to be a little careful with what is going on right at x =1 as technically that will only be valid for the bottom function. But, we'll deal along with that at the very end while we actually do the graph.  For now, we will employ x = 1 in both functions.

Here the first thing to do is to get a table of values for each function on the particular range and again we will employ function. x = 1 in both even though technically it only have to be used with the bottom


- x2 + 4

( x, y )



(-2, 0)



( -1, 3)



(0, 4)



(1, 3)




2 x -1


( x, y )






( 2, 3)



(3, 5)

Following is a sketch of the graph and notice how we indicated the points at x = 1 .  For the top function we utilized an open dot for the point at x = 1 and for the bottom function we utilized a closed dot at x = 1 .  In this way we make it apparent on the graph that only the bottom function actually has a point at x = 1 .

614_Graph of piecewise functions1.png

Notice that as the two graphs didn't meet at x = 1 we left a blank space in the graph. Do not connect these two points along a line. There actually does have to be a break there to indicate that the two portions do not meet at x = 1 .

Sometimes the two portions will meet at these points & at other times they won't.  We have not ever expected them to meet or not to meet till we've in fact sketched the graph.

Posted Date: 4/8/2013 1:14:41 AM | Location : United States

Related Discussions:- Graph of piecewise functions, Assignment Help, Ask Question on Graph of piecewise functions, Get Answer, Expert's Help, Graph of piecewise functions Discussions

Write discussion on Graph of piecewise functions
Your posts are moderated
Related Questions
#questionSolve the system graphically. If the system has an infinite number of solutions, use set builder notation to write the solution set. If the system has no solution, state t

Finding Zeroes of a polynomial The below given fact will also be useful on occasion in determining the zeroes of a polynomial. Fact If P (x) is a polynomial & we know t

This section doesn't actually have many to do with the rest of this chapter, but since the subject required to be covered and it was a fairly short chapter it appeared like as good

if a-b equals 73 what is a

how do i solve transformations,one to one formuals onto formulas

show that -b/b-a may be properly changed to b/ steps