Matemática discreta Exemplos

f (x) = \frac{x}{\sqrt[3]{x^{2} - 1}}

$f (x) = \frac{x}{\sqrt[3]{x^{2} - 1}}$

Etapa 1

Simplifique

f (x)

$f (x)$ .

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Etapa 1.1

Simplifique o denominador.

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Etapa 1.1.1

Reescreva

1

$1$ como

1^{2}

$1^{2}$ .

f (x) = \frac{x}{\sqrt[3]{x^{2} - 1^{2}}}

$f (x) = \frac{x}{\sqrt[3]{x^{2} - 1^{2}}}$

Etapa 1.1.2

Como os dois termos são quadrados perfeitos, fatore usando a fórmula da diferença de quadrados,

a^{2} - b^{2} = (a + b) (a - b)

$a^{2} - b^{2} = (a + b) (a - b)$ em que

a = x

$a = x$ e

b = 1

$b = 1$ .

f (x) = \frac{x}{\sqrt[3]{(x + 1) (x - 1)}}

$f (x) = \frac{x}{\sqrt[3]{(x + 1) (x - 1)}}$

f (x) = \frac{x}{\sqrt[3]{(x + 1) (x - 1)}}

$f (x) = \frac{x}{\sqrt[3]{(x + 1) (x - 1)}}$

Etapa 1.2

Multiplique

\frac{x}{\sqrt[3]{(x + 1) (x - 1)}}

$\frac{x}{\sqrt[3]{(x + 1) (x - 1)}}$ por

\frac{{\sqrt[3]{(x + 1) (x - 1)}}^{2}}{{\sqrt[3]{(x + 1) (x - 1)}}^{2}}

$\frac{{\sqrt[3]{(x + 1) (x - 1)}}^{2}}{{\sqrt[3]{(x + 1) (x - 1)}}^{2}}$ .

f (x) = \frac{x}{\sqrt[3]{(x + 1) (x - 1)}} \cdot \frac{{\sqrt[3]{(x + 1) (x - 1)}}^{2}}{{\sqrt[3]{(x + 1) (x - 1)}}^{2}}

$f (x) = \frac{x}{\sqrt[3]{(x + 1) (x - 1)}} \cdot \frac{{\sqrt[3]{(x + 1) (x - 1)}}^{2}}{{\sqrt[3]{(x + 1) (x - 1)}}^{2}}$

Etapa 1.3

Combine e simplifique o denominador.

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Etapa 1.3.1

Multiplique

\frac{x}{\sqrt[3]{(x + 1) (x - 1)}}

$\frac{x}{\sqrt[3]{(x + 1) (x - 1)}}$ por

\frac{{\sqrt[3]{(x + 1) (x - 1)}}^{2}}{{\sqrt[3]{(x + 1) (x - 1)}}^{2}}

$\frac{{\sqrt[3]{(x + 1) (x - 1)}}^{2}}{{\sqrt[3]{(x + 1) (x - 1)}}^{2}}$ .

f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{\sqrt[3]{(x + 1) (x - 1)} {\sqrt[3]{(x + 1) (x - 1)}}^{2}}

$f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{\sqrt[3]{(x + 1) (x - 1)} {\sqrt[3]{(x + 1) (x - 1)}}^{2}}$

Etapa 1.3.2

Eleve

\sqrt[3]{(x + 1) (x - 1)}

$\sqrt[3]{(x + 1) (x - 1)}$ à potência de

1

$1$ .

f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{\sqrt[3]{(x + 1) (x - 1)} {\sqrt[3]{(x + 1) (x - 1)}}^{2}}

$f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{\sqrt[3]{(x + 1) (x - 1)} {\sqrt[3]{(x + 1) (x - 1)}}^{2}}$

Etapa 1.3.3

Use a regra da multiplicação de potências

a^{m} a^{n} = a^{m + n}

$a^{m} a^{n} = a^{m + n}$ para combinar expoentes.

f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{{\sqrt[3]{(x + 1) (x - 1)}}^{1 + 2}}

$f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{{\sqrt[3]{(x + 1) (x - 1)}}^{1 + 2}}$

Etapa 1.3.4

Some

1

$1$ e

2

$2$ .

f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{{\sqrt[3]{(x + 1) (x - 1)}}^{3}}

$f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{{\sqrt[3]{(x + 1) (x - 1)}}^{3}}$

Etapa 1.3.5

Reescreva

{\sqrt[3]{(x + 1) (x - 1)}}^{3}

${\sqrt[3]{(x + 1) (x - 1)}}^{3}$ como

(x + 1) (x - 1)

$(x + 1) (x - 1)$ .

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Etapa 1.3.5.1

Use

\sqrt[n]{a^{x}} = a^{\frac{x}{n}}

$\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ para reescrever

\sqrt[3]{(x + 1) (x - 1)}

$\sqrt[3]{(x + 1) (x - 1)}$ como

{((x + 1) (x - 1))}^{\frac{1}{3}}

${((x + 1) (x - 1))}^{\frac{1}{3}}$ .

f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{{({((x + 1) (x - 1))}^{\frac{1}{3}})}^{3}}

$f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{{({((x + 1) (x - 1))}^{\frac{1}{3}})}^{3}}$

Etapa 1.3.5.2

Aplique a regra da multiplicação de potências e multiplique os expoentes,

{(a^{m})}^{n} = a^{m n}

${(a^{m})}^{n} = a^{m n}$ .

f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{{((x + 1) (x - 1))}^{\frac{1}{3} \cdot 3}}

$f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{{((x + 1) (x - 1))}^{\frac{1}{3} \cdot 3}}$

Etapa 1.3.5.3

Combine

\frac{1}{3}

$\frac{1}{3}$ e

3

$3$ .

f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{{((x + 1) (x - 1))}^{\frac{3}{3}}}

$f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{{((x + 1) (x - 1))}^{\frac{3}{3}}}$

Etapa 1.3.5.4

Cancele o fator comum de

3

$3$ .

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Etapa 1.3.5.4.1

Cancele o fator comum.

f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{{((x + 1) (x - 1))}^{\frac{3}{3}}}

$f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{{((x + 1) (x - 1))}^{\frac{3}{3}}}$

Etapa 1.3.5.4.2

Reescreva a expressão.

f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{(x + 1) (x - 1)}

$f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{(x + 1) (x - 1)}$

f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{(x + 1) (x - 1)}

$f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{(x + 1) (x - 1)}$

Etapa 1.3.5.5

Simplifique.

f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{(x + 1) (x - 1)}

$f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{(x + 1) (x - 1)}$

f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{(x + 1) (x - 1)}

$f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{(x + 1) (x - 1)}$

f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{(x + 1) (x - 1)}

$f (x) = \frac{x {\sqrt[3]{(x + 1) (x - 1)}}^{2}}{(x + 1) (x - 1)}$

Etapa 1.4

Simplifique o numerador.

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Etapa 1.4.1

Reescreva

{\sqrt[3]{(x + 1) (x - 1)}}^{2}

${\sqrt[3]{(x + 1) (x - 1)}}^{2}$ como

\sqrt[3]{{((x + 1) (x - 1))}^{2}}

$\sqrt[3]{{((x + 1) (x - 1))}^{2}}$ .

f (x) = \frac{x \sqrt[3]{{((x + 1) (x - 1))}^{2}}}{(x + 1) (x - 1)}

$f (x) = \frac{x \sqrt[3]{{((x + 1) (x - 1))}^{2}}}{(x + 1) (x - 1)}$

Etapa 1.4.2

Aplique a regra do produto a

(x + 1) (x - 1)

$(x + 1) (x - 1)$ .

f (x) = \frac{x \sqrt[3]{{(x + 1)}^{2} {(x - 1)}^{2}}}{(x + 1) (x - 1)}

$f (x) = \frac{x \sqrt[3]{{(x + 1)}^{2} {(x - 1)}^{2}}}{(x + 1) (x - 1)}$

f (x) = \frac{x \sqrt[3]{{(x + 1)}^{2} {(x - 1)}^{2}}}{(x + 1) (x - 1)}

$f (x) = \frac{x \sqrt[3]{{(x + 1)}^{2} {(x - 1)}^{2}}}{(x + 1) (x - 1)}$

f (x) = \frac{x \sqrt[3]{{(x + 1)}^{2} {(x - 1)}^{2}}}{(x + 1) (x - 1)}

$f (x) = \frac{x \sqrt[3]{{(x + 1)}^{2} {(x - 1)}^{2}}}{(x + 1) (x - 1)}$

Etapa 2

The word linear is used for a straight line. A linear function is a function of a straight line, which means that the degree of a linear function must be

0

$0$ or

1

$1$ . In this case, The degree of

f (x) = \frac{x \sqrt[3]{{(x + 1)}^{2} {(x - 1)}^{2}}}{(x + 1) (x - 1)}

$f (x) = \frac{x \sqrt[3]{{(x + 1)}^{2} {(x - 1)}^{2}}}{(x + 1) (x - 1)}$ is

- 1

$- 1$ , which makes the function a nonlinear function.

f (x) = \frac{x \sqrt[3]{{(x + 1)}^{2} {(x - 1)}^{2}}}{(x + 1) (x - 1)}

$f (x) = \frac{x \sqrt[3]{{(x + 1)}^{2} {(x - 1)}^{2}}}{(x + 1) (x - 1)}$ is not a linear function