Page 48 - Complex numbers
P. 48
Example 13:
Find the complex roots of the following cubic
equations.
3
2
1. 3.84 − 2.65 − 7.17 + 7.097
2
3
2. −5.35 + 1.59 − 2.79 − 4.33
2
3
3. 8.2 − 6.43 + 9.70 + 3.27
3
2
4. 4 − 8 + 6 − 2
To solve cubic equations, enter ((MODE)54), then
enter the coefficients.
2
3
1 3.84 − 2.65 − 7.17 + 7.097
3.84=z2.65=z7.
17=7.097=
= =n =n
You will observe there is one real root and two
complex roots. As with the quadratic roots, they occur
as conjugate pairs. You will also notice the high
precision of the root values, it would very difficult to
perform these calculations manually, but very easy for
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