HP 33S User Manual page 3

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HP 33S Solving for roots
If the checksum of the program just entered does not equal 9EAF, then you have not entered it correctly.
To clear the checksum display press:
In RPN or algebraic mode: ¹£
Then, to exit the program environment, press:
In RPN or algebraic mode: ¹£
Store an initial guess for X of 10 into the variable X. Then set the function to X and solve for the value of X.
Note that the SOLVE function is located on the cursor key area at the top of the HP 33S calculator. If you
are unsure of its location, see the image at the end of this training aid.
In RPN or algebraic mode: 10eXºsXÛX
Since you feel this equation has a negative root as well, store a new guess for X of -10 into the variable X.
There is no need to set the function to X (since it has already been done). Solve for the value of X.
In RPN or algebraic mode: 10zeXÛX
Answer: Roots found for the equation are –2 and +2.
Example 2: Solve for the roots of Y = X
Solution: We're looking for values of X such that X
value of the function. If a program already exists in program memory with the name of X, then it will need to
be cleared. This can be done by pressing ¹uÕÏ to have the HP 33S display the list of
programs in the calculator and then press Ø to step through the program labels. When the label of the
program to be deleted is shown in the display, pressing ¹¡will delete that program from the
calculator's memory. Pressing Å will then clear the display and allow you to proceed.
In RPN or algebraic mode: ¹£¹ÓXºd
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– 7X + 12
2
– 7X + 12 = 0. First, we'll enter a program that computes the
2
hX)2Ã7¸hXÙ12Ï
ºÔ
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Figure 3
Figure 4
Figure 5
HP 33S Solving for roots - Version 1.0