Roots Of A Quadratic Equation - HP -22S Owner's Manual

Scientific calculator.

Example: Length of a Line.
Part 1:
Calculate the hypotenuse of a
right triangle with sides of 7 and 8 cm.
Keys:
Display:
Description:
1 EVALI
X?value
Prompts for X.
711NPUTI
Y?value
Stores X, prompts for
Y.
81 INPUT I
Z?value
Stores Y, prompts for
z.
o
1 INPUT I
R= 113.63131
Sets Z
=
0, calculates
the hypotenuse.
Part 2:
A right triangle has a hypotenuse of 9 cm. One side equals 4
cm. Find the length of the other side.
.1
SOLVE I
{X}
R? 113.63131
Selects X, prompts for
the hypotenuse.
9 1 INPUT I
Y?8.eeee
Stores R, prompts for
Y.
41lNPuTI
z?e.eeee
Stores Y, prompts for
Z.
I
INPUT I
X=8.e623
Retains Z=O, calcu-
lates X.
Roots of a Quadratic Equation
The following equation solves for the real root(s) of a quadratic equa-
tion ax
2
+
bx
+
c
=
0:
where
A,
B, C
=
J
=
the coefficients.
the control variable (J
=
±
1). To calculate both
roots, evaluate the equation with
J
=
+
1
and
J =
-1.
7: The Equation Library
93  