Posted by Modulus Function on .
Sketch y=(x1)(x3) and y=x^24x .
I don't know how to sketch the graphs :(

math 
Reiny,
in your previous post I showed you how to graph the absolute value of linear function.
The same concept is true for the above quadratics
for y=(x1)(x3)
You will have two parabolas, one is
y = (x1)(x3) the other is y = (x1)(x3)
one will open up , the other will open down
They both have the same xintercepts of 1 and 3
So sketch both of them, then erase the part of both of them that lies below the xaxis.
Do the same for the second equation.
They will have similar shapes, except the second has xintercepts of 2 and 2 
math 
Anonymous,
i still don't really understand. How can i sketch y=(x1)(x3) and y=(x1)(x3) ? what is the coordinate?