7 Using the Solver
Unfortunately the
Let's suppose we want to solve the equation x2−5 x4=0 . We are going to enter it in a program. For example:
01 LBL “FX” (“FX” is the global name of the program)
02 MVAR “X” (You find this in Solver menu. I will explain this later) 03 RCL “X”
04X↑2
055
06RCL “X”
07x
08-
094
10+
11END
Well, as you can see we don't enter the equation f(x)=0 but just the function f(x). The MVAR function tells the calculator what variables must appear in the solver menu. We suppose all variables are in the memory so we use RCL function.
Now we leave the program mode and we go to the Solver menu. What should appear is
Select Solve Program
Then in our case we select FX and we give a start value, for example 8 and we press X to enter this value. Again we press X to calculate the correct value of x which give to us X=4.
But this equation does not have only one solution. X=1 is also a solution. To get it we can enter 2 for example for the start value.
If you want to solve numerically many equations of the form a x2bxc=0 you can write a program such as
01 LBL “FX”
02 MVAR “A”
03 MVAR “B”
04 MVAR “C”
05 MVAR “X”
06 RCL “X”
07 X↑2
08 RCL “A”
09x
10RCL “B”
11RCL “X”
12x
13+
14RCL “C'