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Activities 49
Displaying Complex Results
Now solve the equation 2x
2
N x + 3 = 0. When you set a+bi complex
number mode, the TI-84 Plus displays complex results.
5. Press } to move the cursor onto the
+ sign
in the formula. Press ¹ to edit the
quadratic-formula expression to become:
6. Press Í to find the other solution for
the quadratic equation 3x
2
+5x+2=0.
1. Press z † † † † † † (6 times), and
then press ~ to position the cursor over
a+bi. Press Í to select a+bi complex-
number mode.
2. Press y 5 (above z) to return to the
home screen, and then press ‘ to clear
it.
3. Press 2 ¿ ƒ [A] ƒ [:] Ì 1 ¿
ƒ [B] ƒ [:] 3 ¿ ƒ [C] Í.
The coefficient of the x
2
term, the
coefficient of the X term, and the constant
for the new equation are stored to A, B,
and C, respectively.
4. Press y [ to recall the store
instruction, and then press y [ again
to recall the quadratic-formula expression,
5. Press Í to find one solution for the
equation 2x
2
N x+3=0.
b– b
2
4ac––
2a
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b– b
2
4ac––
2a
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