HOW CAN WE HELP YOU?
Below are our most common frequently asked questions.
fx-CP400 ClassPad II
Information accurate for OS 3.06.1000.
If information is known about a function and/or its derivative, and the function contains unknown co-efficients, then that information can be used to determine the value of the unknown co-efficients.
In the example below, it is known that the quadratic function defined as f(x) has a turning point at (3,9). If we define g(x) as the derivative of f(x) then we have two equations, f(3)=9 and g(3)=0, and two unknowns, a and b. If we tap ~ then these equations can be entered, and the unknowns can be solved for, as shown.
NOTE: OVER-SPECIFIED SYSTEMS OF EQUATIONS.
If the number of equations exceeds the number of unknowns then the system of equations can still be solved, assuming that the equations are consistent.
Classpad II Series
This PDF file contains instructions on how to update the Operating System of the Classpad II Series calculator:
Classpad 330 and 330 PLUS Series
This PDF file contains instructions on how to update the Operating System of the Classpad 330 and 330 PLUS Series calculator:
A range of algebraic and graphical results relating to complex numbers can be obtained using a ClassPad. This is done by firstly ensuring that the ClassPad’s setting are correct, and then entering the relevant information. The settings required are shown below:
When looking to obtain graphal results in the complex plane using a ClassPad, firstly define z as a complex number x+yi.
With that done, constraints on z can be entered, and then the ClassPad’s output can be expressed in the form “y=…” so that its graphical meaning is apparent. If this output is then dragged into a graph window, then a graph can be obtained.
Two examples of this process are shown below:
Some work undertaken with a ClassPad leads users to define x as a specific ‘thing’, maybe a matrix or a real or complex number. This definition is retained by the ClassPad until we “clear all variables”. This means that if we attempt to work with x as a variable, when it has been defined previously, unexpected errors and outputs are likely to occur.
To “clear all variables”, when in Main, tap Edit and Clear All Variables.
To check if there is an issue with x (or any other variable you wish to use), input x (in Main). The output should be x if it is to be used as a variable.