HP 33S - Page 332

D–12 More about Solving
File name 33s-E-Manual-1008-Publication(1st).doc Page : 386
Printed Date : 2003/10/8 Size : 13.7 x 21.2 cm
Example: A Math Error.
Find the root of the equation:
05.00.3)] (x [x =−+÷
Enter the equation as an expression:
Keys: Display: Description:
º d

Selects Equation mode.
? h
X
¯ º
y h
X
Ù Ë
3
º | º | Ã
Ë
5
Ï




Enters the equation.
º Î


Checksum and length.
Å

Cancels Equation mode.
First attempt to find a positive root:
Keys: Display: Description:
0
e
X
10


_

Your positive
g
uesses for
the root.
º d

Selects Equation mode;
displays the left end of
the equation.
Û
X


Calculates the root usin
g
guesses 0 and 10.
Now attempt to find a negative root by entering guesses 0 and –10. Notice that
the function is undefined for values of x between 0 and –0.3 since those values
produce a positive denominator but a negative numerator, causing a negative
square root.
Keys: Display: Description:
0
e
X
10
z


_

º d

Selects Equation mode;
displays the left end of
the equation.