HP HP-28S - Page 109

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