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6 Getting Started
8300GETM.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 11:06 AM Printed: 02/19/01 11:06
AM Page 6 of 18
Use the quadratic formula to solve the quadratic equations 3X
2
+ 5X + 2 = 0
and 2X
2
N
X + 3 = 0. Begin with the equation 3X
2
+ 5X + 2 = 0.
1. Press
3
¿
ƒ
[
A
] (above
) to
store the coefficient of the X
2
term.
2. Press
ƒ
[
:
] (above
Ë
). The colon
allows you to enter more than one
instruction on a line.
3. Press
5
¿
ƒ
[
B
] (above
) to
store the coefficient of the X
term. Press
ƒ
[
:
] to enter a new instruction on
the same line. Press
2
¿
ƒ
[
C
]
(above
) to store the constant.
4. Press
Í
to store the values to the
variables A, B, and C.
The last value you stored is shown on the
right side of the display. The cursor moves
to the next line, ready for your next entry.
5. Press
£
Ì
ƒ
[
B
]
Ã
y
[
‡
]
ƒ
[
B
]
¡
¹
4
ƒ
[
A
]
ƒ
[
C
]
¤
¤
¥
£
2
ƒ
[
A
]
¤
to enter the expression for
one of the solutions for the quadratic
formula,
−
+−
bb ac
a
2
4
2
6. Press
Í
to find one solution for the
equation 3X
2
+ 5X + 2 = 0.
The answer is shown on the right side of
the display. The cursor moves to the next
line, ready for you to enter the next
expression.
Entering a Calculation: The Quadratic Formula