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Activities 47
2
Activities
The Quadratic Formula
Entering a Calculation
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 Œ) 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 C ƒ [B] ¡
¹
4 ƒ [A] ƒ [C] ¤ ¤ ¥ £ 2 ƒ
[A] ¤ to enter the expression for one of
the solutions for the quadratic formula,
b– b
2
4ac–±
2a
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