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HP -28S Manual Page 109

Advanced scientific calculator.
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Put the name X on the stack, indicating the variable for which you're
solving.
CJ
X
I
ENTER
I
Calculate the zeros, using QUAD
(quadratic)
in the SOLVE menu.
I
SOLV
I
QUAD
This expression represents both solutions to the quadratic expression.
The variable sl represents an arbitrary sign, either
+
1 or -1, and
each value of sl corresponds to a zero of the expression.
Store the expression as the current equation.
ST.O
I=L-~
-mm--BIl!1D--IBDIII--I!WlIII--IimI----.1
Display the Solver menu.
SOLVR
sl is the only variable in the current equation.
First make sl a positive sign.
If:'-
I
tkJEXffilc:::Jc:::Jc:::Jc:::J
Return one of the solutions to level 1.
I'r'~a
41
OIJEXffilc:::Jc:::Jc:::Jc:::J
108
9: Symbolic Solutions

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