Tuesday, May 12, 2009

WOF Portfolio

How is it going? What questions do you have about it? Any thoughts?

Here is a site that explains how to graph piecewise functions on the TI calculator.

Say my equations is
Y1 = -(X-2)^2 + 4

If you graph that equation, then you will see that the function has negative values when x <= 0 and when x>= 4. If you only wanted the positive values, you can enter that into the calculator by typing:
Y2 = (Y1)(X>=0)(X<=4)

NOTE: Type all of the parentheses. Use VARS -> Y_VARS -> Functions -> Y1 to enter Y1 and 2ND -> MATH -> 4 to enter >=.

Some other cool things with the calculator...type:
Y3 = Y2(X-2)
Note the placement of the parentheses. What happens? This is like doing f(x-2) or shifting the function 2 spaces to the right. Look at the table to verify this.

You could also combine functions...type:
Y4 = Y2 + Y3
What happened? Look at the table to verify this.

Wednesday, May 6, 2009

Almost Done with WOF

Just one more topic to go....
Transformation of graphs...some books like to say translation.

Here is a link that describes shifts, stretches, and shrinks. Here is another link. This is a cool powerpoint presentation. And finally, here is a pdf file.

Here is an interactive site.