Matemática discreta Ejemplos

$(z - 4 (\cos (\frac{π}{5}) + i \sin (\frac{π}{5}))) (z - 4 (\cos (\frac{π}{5}) + i \sin (\frac{π}{5})))$

Paso 1

Simplifica los términos.

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Paso 1.1

Aplica la propiedad distributiva.

$(z - 4 \cos (\frac{π}{5}) - 4 i \sin (\frac{π}{5})) (z - 4 (\cos (\frac{π}{5}) + i \sin (\frac{π}{5})))$

Paso 1.2

Aplica la propiedad distributiva.

$(z - 4 \cos (\frac{π}{5}) - 4 i \sin (\frac{π}{5})) (z - 4 \cos (\frac{π}{5}) - 4 i \sin (\frac{π}{5}))$

Paso 2

Expande $(z - 4 \cos (\frac{π}{5}) - 4 i \sin (\frac{π}{5})) (z - 4 \cos (\frac{π}{5}) - 4 i \sin (\frac{π}{5}))$ mediante la multiplicación de cada término de la primera expresión por cada término de la segunda expresión.

$z \cdot z + z (- 4 \cos (\frac{π}{5})) + z (- 4 i \sin (\frac{π}{5})) - 4 \cos (\frac{π}{5}) z - 4 \cos (\frac{π}{5}) (- 4 \cos (\frac{π}{5})) - 4 \cos (\frac{π}{5}) (- 4 i \sin (\frac{π}{5})) - 4 i \sin (\frac{π}{5}) z - 4 i \sin (\frac{π}{5}) (- 4 \cos (\frac{π}{5})) - 4 i \sin (\frac{π}{5}) (- 4 i \sin (\frac{π}{5}))$

Paso 3

Simplifica los términos.

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Paso 3.1

Simplifica cada término.

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Paso 3.1.1

Multiplica $z$ por $z$ .

$z^{2} + z (- 4 \cos (\frac{π}{5})) + z (- 4 i \sin (\frac{π}{5})) - 4 \cos (\frac{π}{5}) z - 4 \cos (\frac{π}{5}) (- 4 \cos (\frac{π}{5})) - 4 \cos (\frac{π}{5}) (- 4 i \sin (\frac{π}{5})) - 4 i \sin (\frac{π}{5}) z - 4 i \sin (\frac{π}{5}) (- 4 \cos (\frac{π}{5})) - 4 i \sin (\frac{π}{5}) (- 4 i \sin (\frac{π}{5}))$

Paso 3.1.2

Multiplica $- 4 \cos (\frac{π}{5}) (- 4 \cos (\frac{π}{5}))$ .

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Paso 3.1.2.1

Multiplica $- 4$ por $- 4$ .

$z^{2} + z (- 4 \cos (\frac{π}{5})) + z (- 4 i \sin (\frac{π}{5})) - 4 \cos (\frac{π}{5}) z + 16 \cos (\frac{π}{5}) \cos (\frac{π}{5}) - 4 \cos (\frac{π}{5}) (- 4 i \sin (\frac{π}{5})) - 4 i \sin (\frac{π}{5}) z - 4 i \sin (\frac{π}{5}) (- 4 \cos (\frac{π}{5})) - 4 i \sin (\frac{π}{5}) (- 4 i \sin (\frac{π}{5}))$

Paso 3.1.2.2

Eleva $\cos (\frac{π}{5})$ a la potencia de $1$ .

$z^{2} + z (- 4 \cos (\frac{π}{5})) + z (- 4 i \sin (\frac{π}{5})) - 4 \cos (\frac{π}{5}) z + 16 (\cos^{1} (\frac{π}{5}) \cos (\frac{π}{5})) - 4 \cos (\frac{π}{5}) (- 4 i \sin (\frac{π}{5})) - 4 i \sin (\frac{π}{5}) z - 4 i \sin (\frac{π}{5}) (- 4 \cos (\frac{π}{5})) - 4 i \sin (\frac{π}{5}) (- 4 i \sin (\frac{π}{5}))$

Paso 3.1.2.3

Eleva $\cos (\frac{π}{5})$ a la potencia de $1$ .

$z^{2} + z (- 4 \cos (\frac{π}{5})) + z (- 4 i \sin (\frac{π}{5})) - 4 \cos (\frac{π}{5}) z + 16 (\cos^{1} (\frac{π}{5}) \cos^{1} (\frac{π}{5})) - 4 \cos (\frac{π}{5}) (- 4 i \sin (\frac{π}{5})) - 4 i \sin (\frac{π}{5}) z - 4 i \sin (\frac{π}{5}) (- 4 \cos (\frac{π}{5})) - 4 i \sin (\frac{π}{5}) (- 4 i \sin (\frac{π}{5}))$

Paso 3.1.2.4

Usa la regla de la potencia $a^{m} a^{n} = a^{m + n}$ para combinar exponentes.

$z^{2} + z (- 4 \cos (\frac{π}{5})) + z (- 4 i \sin (\frac{π}{5})) - 4 \cos (\frac{π}{5}) z + 16 {\cos (\frac{π}{5})}^{1 + 1} - 4 \cos (\frac{π}{5}) (- 4 i \sin (\frac{π}{5})) - 4 i \sin (\frac{π}{5}) z - 4 i \sin (\frac{π}{5}) (- 4 \cos (\frac{π}{5})) - 4 i \sin (\frac{π}{5}) (- 4 i \sin (\frac{π}{5}))$

Paso 3.1.2.5

Suma $1$ y $1$ .

$z^{2} + z (- 4 \cos (\frac{π}{5})) + z (- 4 i \sin (\frac{π}{5})) - 4 \cos (\frac{π}{5}) z + 16 \cos^{2} (\frac{π}{5}) - 4 \cos (\frac{π}{5}) (- 4 i \sin (\frac{π}{5})) - 4 i \sin (\frac{π}{5}) z - 4 i \sin (\frac{π}{5}) (- 4 \cos (\frac{π}{5})) - 4 i \sin (\frac{π}{5}) (- 4 i \sin (\frac{π}{5}))$

Paso 3.1.3

Multiplica $- 4$ por $- 4$ .

$z^{2} + z (- 4 \cos (\frac{π}{5})) + z (- 4 i \sin (\frac{π}{5})) - 4 \cos (\frac{π}{5}) z + 16 \cos^{2} (\frac{π}{5}) + 16 \cos (\frac{π}{5}) (i \sin (\frac{π}{5})) - 4 i \sin (\frac{π}{5}) z - 4 i \sin (\frac{π}{5}) (- 4 \cos (\frac{π}{5})) - 4 i \sin (\frac{π}{5}) (- 4 i \sin (\frac{π}{5}))$

Paso 3.1.4

Multiplica $- 4$ por $- 4$ .

$z^{2} + z (- 4 \cos (\frac{π}{5})) + z (- 4 i \sin (\frac{π}{5})) - 4 \cos (\frac{π}{5}) z + 16 \cos^{2} (\frac{π}{5}) + 16 \cos (\frac{π}{5}) i \sin (\frac{π}{5}) - 4 i \sin (\frac{π}{5}) z + 16 i \sin (\frac{π}{5}) \cos (\frac{π}{5}) - 4 i \sin (\frac{π}{5}) (- 4 i \sin (\frac{π}{5}))$

Paso 3.1.5

Multiplica $- 4 i \sin (\frac{π}{5}) (- 4 i \sin (\frac{π}{5}))$ .

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Paso 3.1.5.1

Multiplica $- 4$ por $- 4$ .

$z^{2} + z (- 4 \cos (\frac{π}{5})) + z (- 4 i \sin (\frac{π}{5})) - 4 \cos (\frac{π}{5}) z + 16 \cos^{2} (\frac{π}{5}) + 16 \cos (\frac{π}{5}) i \sin (\frac{π}{5}) - 4 i \sin (\frac{π}{5}) z + 16 i \sin (\frac{π}{5}) \cos (\frac{π}{5}) + 16 i \sin (\frac{π}{5}) (i \sin (\frac{π}{5}))$

Paso 3.1.5.2

Eleva $i$ a la potencia de $1$ .

$z^{2} + z (- 4 \cos (\frac{π}{5})) + z (- 4 i \sin (\frac{π}{5})) - 4 \cos (\frac{π}{5}) z + 16 \cos^{2} (\frac{π}{5}) + 16 \cos (\frac{π}{5}) i \sin (\frac{π}{5}) - 4 i \sin (\frac{π}{5}) z + 16 i \sin (\frac{π}{5}) \cos (\frac{π}{5}) + 16 (i^{1} i) \sin (\frac{π}{5}) \sin (\frac{π}{5})$

Paso 3.1.5.3

Eleva $i$ a la potencia de $1$ .

$z^{2} + z (- 4 \cos (\frac{π}{5})) + z (- 4 i \sin (\frac{π}{5})) - 4 \cos (\frac{π}{5}) z + 16 \cos^{2} (\frac{π}{5}) + 16 \cos (\frac{π}{5}) i \sin (\frac{π}{5}) - 4 i \sin (\frac{π}{5}) z + 16 i \sin (\frac{π}{5}) \cos (\frac{π}{5}) + 16 (i^{1} i^{1}) \sin (\frac{π}{5}) \sin (\frac{π}{5})$

Paso 3.1.5.4

Usa la regla de la potencia $a^{m} a^{n} = a^{m + n}$ para combinar exponentes.

$z^{2} + z (- 4 \cos (\frac{π}{5})) + z (- 4 i \sin (\frac{π}{5})) - 4 \cos (\frac{π}{5}) z + 16 \cos^{2} (\frac{π}{5}) + 16 \cos (\frac{π}{5}) i \sin (\frac{π}{5}) - 4 i \sin (\frac{π}{5}) z + 16 i \sin (\frac{π}{5}) \cos (\frac{π}{5}) + 16 i^{1 + 1} \sin (\frac{π}{5}) \sin (\frac{π}{5})$

Paso 3.1.5.5

Suma $1$ y $1$ .

$z^{2} + z (- 4 \cos (\frac{π}{5})) + z (- 4 i \sin (\frac{π}{5})) - 4 \cos (\frac{π}{5}) z + 16 \cos^{2} (\frac{π}{5}) + 16 \cos (\frac{π}{5}) i \sin (\frac{π}{5}) - 4 i \sin (\frac{π}{5}) z + 16 i \sin (\frac{π}{5}) \cos (\frac{π}{5}) + 16 i^{2} \sin (\frac{π}{5}) \sin (\frac{π}{5})$

Paso 3.1.5.6

Eleva $\sin (\frac{π}{5})$ a la potencia de $1$ .

$z^{2} + z (- 4 \cos (\frac{π}{5})) + z (- 4 i \sin (\frac{π}{5})) - 4 \cos (\frac{π}{5}) z + 16 \cos^{2} (\frac{π}{5}) + 16 \cos (\frac{π}{5}) i \sin (\frac{π}{5}) - 4 i \sin (\frac{π}{5}) z + 16 i \sin (\frac{π}{5}) \cos (\frac{π}{5}) + 16 i^{2} (\sin^{1} (\frac{π}{5}) \sin (\frac{π}{5}))$

Paso 3.1.5.7

Eleva $\sin (\frac{π}{5})$ a la potencia de $1$ .

$z^{2} + z (- 4 \cos (\frac{π}{5})) + z (- 4 i \sin (\frac{π}{5})) - 4 \cos (\frac{π}{5}) z + 16 \cos^{2} (\frac{π}{5}) + 16 \cos (\frac{π}{5}) i \sin (\frac{π}{5}) - 4 i \sin (\frac{π}{5}) z + 16 i \sin (\frac{π}{5}) \cos (\frac{π}{5}) + 16 i^{2} (\sin^{1} (\frac{π}{5}) \sin^{1} (\frac{π}{5}))$

Paso 3.1.5.8

Usa la regla de la potencia $a^{m} a^{n} = a^{m + n}$ para combinar exponentes.

Paso 3.1.5.9

Suma $1$ y $1$ .

Paso 3.1.6

Reescribe $i^{2}$ como $- 1$ .

Paso 3.1.7

Multiplica $16$ por $- 1$ .

Paso 3.2

Simplifica mediante la adición de términos.

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Paso 3.2.1

Mueve $\cos (\frac{π}{5})$ .

$z^{2} - 4 \cdot z \cos (\frac{π}{5}) - 4 z \cos (\frac{π}{5}) + z (- 4 i \sin (\frac{π}{5})) + 16 \cos^{2} (\frac{π}{5}) + 16 \cos (\frac{π}{5}) i \sin (\frac{π}{5}) - 4 i \sin (\frac{π}{5}) z + 16 i \sin (\frac{π}{5}) \cos (\frac{π}{5}) - 16 \sin^{2} (\frac{π}{5})$

Paso 3.2.2

Resta $4 z \cos (\frac{π}{5})$ de $- 4 z \cos (\frac{π}{5})$ .

$z^{2} - 8 z \cos (\frac{π}{5}) + z (- 4 i \sin (\frac{π}{5})) + 16 \cos^{2} (\frac{π}{5}) + 16 \cos (\frac{π}{5}) i \sin (\frac{π}{5}) - 4 i \sin (\frac{π}{5}) z + 16 i \sin (\frac{π}{5}) \cos (\frac{π}{5}) - 16 \sin^{2} (\frac{π}{5})$

Paso 3.2.3

Mueve $i$ .

$z^{2} - 8 z \cos (\frac{π}{5}) - 4 \cdot z i \sin (\frac{π}{5}) - 4 z i \sin (\frac{π}{5}) + 16 \cos^{2} (\frac{π}{5}) + 16 \cos (\frac{π}{5}) i \sin (\frac{π}{5}) + 16 i \sin (\frac{π}{5}) \cos (\frac{π}{5}) - 16 \sin^{2} (\frac{π}{5})$

Paso 3.2.4

Resta $4 z i \sin (\frac{π}{5})$ de $- 4 z i \sin (\frac{π}{5})$ .

$z^{2} - 8 z \cos (\frac{π}{5}) - 8 z i \sin (\frac{π}{5}) + 16 \cos^{2} (\frac{π}{5}) + 16 \cos (\frac{π}{5}) i \sin (\frac{π}{5}) + 16 i \sin (\frac{π}{5}) \cos (\frac{π}{5}) - 16 \sin^{2} (\frac{π}{5})$

Paso 3.2.5

Reordena los factores de $16 i \sin (\frac{π}{5}) \cos (\frac{π}{5})$ .

$z^{2} - 8 z \cos (\frac{π}{5}) - 8 z i \sin (\frac{π}{5}) + 16 \cos^{2} (\frac{π}{5}) + 16 \cos (\frac{π}{5}) i \sin (\frac{π}{5}) + 16 i \cos (\frac{π}{5}) \sin (\frac{π}{5}) - 16 \sin^{2} (\frac{π}{5})$

Paso 4

Suma $16 \cos (\frac{π}{5}) i \sin (\frac{π}{5})$ y $16 i \cos (\frac{π}{5}) \sin (\frac{π}{5})$ .

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Paso 4.1

Mueve $\cos (\frac{π}{5})$ .

$z^{2} - 8 z \cos (\frac{π}{5}) - 8 z i \sin (\frac{π}{5}) + 16 \cos^{2} (\frac{π}{5}) + 16 i \cos (\frac{π}{5}) \sin (\frac{π}{5}) + 16 i \cos (\frac{π}{5}) \sin (\frac{π}{5}) - 16 \sin^{2} (\frac{π}{5})$

Paso 4.2

Suma $16 i \cos (\frac{π}{5}) \sin (\frac{π}{5})$ y $16 i \cos (\frac{π}{5}) \sin (\frac{π}{5})$ .

$z^{2} - 8 z \cos (\frac{π}{5}) - 8 z i \sin (\frac{π}{5}) + 16 \cos^{2} (\frac{π}{5}) + 32 i \cos (\frac{π}{5}) \sin (\frac{π}{5}) - 16 \sin^{2} (\frac{π}{5})$