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Popular Álgebra >

solvefor y,(x+sqrt(x^2+1))(y+sqrt(y^2+1))=1

Solução

resolver para

y, (x + x^{2} + 1) (y + y^{2} + 1) = 1

Solução

y = x {x = 0}, y = - x

Passos da solução

(x + x^{2} + 1) (y + y^{2} + 1) = 1

Expandir

(x + x^{2} + 1) (y + y^{2} + 1) : y x + y^{2} + 1 x + y x^{2} + 1 + y^{2} + 1 x^{2} + 1

y x + y^{2} + 1 x + y x^{2} + 1 + y^{2} + 1 x^{2} + 1 = 1

Fatorar

y x + y^{2} + 1 x + y x^{2} + 1 + y^{2} + 1 x^{2} + 1 : (x^{2} + 1 + x) (y + y^{2} + 1)

(x^{2} + 1 + x) (y + y^{2} + 1) = 1

Elevar ambos os lados ao quadrado :

4 y^{2} x^{2} + 4 y^{2} x x^{2} + 1 + 2 y^{2} + 4 y x^{2} y^{2} + 1 + 4 y x y^{2} + 1 x^{2} + 1 + 2 y y^{2} + 1 + 2 x^{2} + 2 x x^{2} + 1 + 1 = 1

4 y^{2} x^{2} + 4 y^{2} x x^{2} + 1 + 2 y^{2} + 4 y x^{2} y^{2} + 1 + 4 y x y^{2} + 1 x^{2} + 1 + 2 y y^{2} + 1 + 2 x^{2} + 2 x x^{2} + 1 + 1 = 1

Subtrair

1

de ambos os lados

4 y^{2} x^{2} + 4 y^{2} x x^{2} + 1 + 2 y^{2} + 4 y x^{2} y^{2} + 1 + 4 y x y^{2} + 1 x^{2} + 1 + 2 y y^{2} + 1 + 2 x^{2} + 2 x x^{2} + 1 + 1 - 1 = 1 - 1

Simplificar

4 y^{2} x^{2} + 4 y^{2} x x^{2} + 1 + 2 y^{2} + 4 y x^{2} y^{2} + 1 + 4 y x y^{2} + 1 x^{2} + 1 + 2 y y^{2} + 1 + 2 x^{2} + 2 x x^{2} + 1 = 0

Mova

4 y^{2} x^{2}

para o lado direito

4 y^{2} x x^{2} + 1 + 2 y^{2} + 4 y x^{2} y^{2} + 1 + 4 y x y^{2} + 1 x^{2} + 1 + 2 y y^{2} + 1 + 2 x^{2} + 2 x x^{2} + 1 = - 4 x^{2} y^{2}

Mova

4 y^{2} x x^{2} + 1

para o lado direito

2 y^{2} + 4 y x^{2} y^{2} + 1 + 4 y x y^{2} + 1 x^{2} + 1 + 2 y y^{2} + 1 + 2 x^{2} + 2 x x^{2} + 1 = - 4 x^{2} y^{2} - 4 y^{2} x x^{2} + 1

Mova

2 y^{2}

para o lado direito

4 y x^{2} y^{2} + 1 + 4 y x y^{2} + 1 x^{2} + 1 + 2 y y^{2} + 1 + 2 x^{2} + 2 x x^{2} + 1 = - 4 x^{2} y^{2} - 4 y^{2} x x^{2} + 1 - 2 y^{2}

Mova

2 x^{2}

para o lado direito

4 y x^{2} y^{2} + 1 + 4 y x y^{2} + 1 x^{2} + 1 + 2 y y^{2} + 1 + 2 x x^{2} + 1 = - 4 x^{2} y^{2} - 4 y^{2} x x^{2} + 1 - 2 y^{2} - 2 x^{2}

Mova

2 x x^{2} + 1

para o lado direito

4 y x^{2} y^{2} + 1 + 4 y x y^{2} + 1 x^{2} + 1 + 2 y y^{2} + 1 = - 4 x^{2} y^{2} - 4 y^{2} x x^{2} + 1 - 2 y^{2} - 2 x^{2} - 2 x x^{2} + 1

Subtrair

- 4 x^{2} y^{2} - 4 y^{2} x x^{2} + 1 - 2 y^{2} - 2 x^{2} - 2 x x^{2} + 1

de ambos os lados

4 y x^{2} y^{2} + 1 + 4 y x y^{2} + 1 x^{2} + 1 + 2 y y^{2} + 1 - (- 4 x^{2} y^{2} - 4 y^{2} x x^{2} + 1 - 2 y^{2} - 2 x^{2} - 2 x x^{2} + 1) = - 4 x^{2} y^{2} - 4 y^{2} x x^{2} + 1 - 2 y^{2} - 2 x^{2} - 2 x x^{2} + 1 - (- 4 x^{2} y^{2} - 4 y^{2} x x^{2} + 1 - 2 y^{2} - 2 x^{2} - 2 x x^{2} + 1)

Simplificar

4 x^{2} y y^{2} + 1 + 4 x y y^{2} + 1 x^{2} + 1 + 2 y y^{2} + 1 + 4 x^{2} y^{2} + 4 x y^{2} x^{2} + 1 + 2 y^{2} + 2 x^{2} + 2 x x^{2} + 1 = 0

Fatorar

4 x^{2} y y^{2} + 1 + 4 x y y^{2} + 1 x^{2} + 1 + 2 y y^{2} + 1 + 4 x^{2} y^{2} + 4 x y^{2} x^{2} + 1 + 2 y^{2} + 2 x^{2} + 2 x x^{2} + 1 : 2 (2 x^{2} y y^{2} + 1 + 2 x y y^{2} + 1 x^{2} + 1 + y y^{2} + 1 + 2 x^{2} y^{2} + 2 x y^{2} x^{2} + 1 + y^{2} + x^{2} + x x^{2} + 1)

2 (2 x^{2} y y^{2} + 1 + 2 x y y^{2} + 1 x^{2} + 1 + y y^{2} + 1 + 2 x^{2} y^{2} + 2 x y^{2} x^{2} + 1 + y^{2} + x^{2} + x x^{2} + 1) = 0

Dividir ambos os lados por

2

2 x^{2} y y^{2} + 1 + 2 x y y^{2} + 1 x^{2} + 1 + y y^{2} + 1 + 2 x^{2} y^{2} + 2 x y^{2} x^{2} + 1 + y^{2} + x^{2} + x x^{2} + 1 = 0

Mova

2 x^{2} y^{2}

para o lado direito

2 x^{2} y y^{2} + 1 + 2 x y y^{2} + 1 x^{2} + 1 + y y^{2} + 1 + 2 x y^{2} x^{2} + 1 + y^{2} + x^{2} + x x^{2} + 1 = - 2 x^{2} y^{2}

Mova

2 x y^{2} x^{2} + 1

para o lado direito

2 x^{2} y y^{2} + 1 + 2 x y y^{2} + 1 x^{2} + 1 + y y^{2} + 1 + y^{2} + x^{2} + x x^{2} + 1 = - 2 x^{2} y^{2} - 2 x y^{2} x^{2} + 1

Mova

y^{2}

para o lado direito

2 x^{2} y y^{2} + 1 + 2 x y y^{2} + 1 x^{2} + 1 + y y^{2} + 1 + x^{2} + x x^{2} + 1 = - 2 x^{2} y^{2} - 2 x y^{2} x^{2} + 1 - y^{2}

Mova

x^{2}

para o lado direito

2 x^{2} y y^{2} + 1 + 2 x y y^{2} + 1 x^{2} + 1 + y y^{2} + 1 + x x^{2} + 1 = - 2 x^{2} y^{2} - 2 x y^{2} x^{2} + 1 - y^{2} - x^{2}

Mova

x x^{2} + 1

para o lado direito

2 x^{2} y y^{2} + 1 + 2 x y y^{2} + 1 x^{2} + 1 + y y^{2} + 1 = - 2 x^{2} y^{2} - 2 x y^{2} x^{2} + 1 - y^{2} - x^{2} - x x^{2} + 1

Fatorar

2 x^{2} y y^{2} + 1 + 2 x y y^{2} + 1 x^{2} + 1 + y y^{2} + 1 : y y^{2} + 1 (2 x^{2} + 2 x x^{2} + 1 + 1)

y y^{2} + 1 (2 x^{2} + 2 x x^{2} + 1 + 1) = - 2 x^{2} y^{2} - 2 x y^{2} x^{2} + 1 - y^{2} - x^{2} - x x^{2} + 1

Dividir ambos os lados por

y (2 x^{2} + 2 x x^{2} + 1 + 1)

y^{2} + 1 = \frac{- 2 x ^{2} y ^{2} - 2 x y ^{2} x ^{2} + 1 - y ^{2} - x ^{2} - x x ^{2} + 1}{y ( 1 + 2 x ^{2} + 2 x x ^{2} + 1 )}

Elevar ambos os lados ao quadrado :

y^{2} + 1 = \frac{8 y ^{4} x ^{4} + 8 y ^{2} x ^{4} + 2 x ^{4} + 8 y ^{4} x ^{3} x ^{2} + 1 + 8 y ^{2} x ^{3} x ^{2} + 1 + 2 x ^{3} x ^{2} + 1 + 8 y ^{4} x ^{2} + 6 y ^{2} x ^{2} + x ^{2} + 4 y ^{4} x x ^{2} + 1 + 2 y ^{2} x x ^{2} + 1 + y ^{4}}{8 y ^{2} x ^{4} + 8 y ^{2} x ^{2} + 4 y ^{2} x x ^{2} + 1 + 8 y ^{2} x ^{3} x ^{2} + 1 + y ^{2}}

y^{2} + 1 = \frac{8 y ^{4} x ^{4} + 8 y ^{2} x ^{4} + 2 x ^{4} + 8 y ^{4} x ^{3} x ^{2} + 1 + 8 y ^{2} x ^{3} x ^{2} + 1 + 2 x ^{3} x ^{2} + 1 + 8 y ^{4} x ^{2} + 6 y ^{2} x ^{2} + x ^{2} + 4 y ^{4} x x ^{2} + 1 + 2 y ^{2} x x ^{2} + 1 + y ^{4}}{8 y ^{2} x ^{4} + 8 y ^{2} x ^{2} + 4 y ^{2} x x ^{2} + 1 + 8 y ^{2} x ^{3} x ^{2} + 1 + y ^{2}}

Resolver

y^{2} + 1 = \frac{8 y ^{4} x ^{4} + 8 y ^{2} x ^{4} + 2 x ^{4} + 8 y ^{4} x ^{3} x ^{2} + 1 + 8 y ^{2} x ^{3} x ^{2} + 1 + 2 x ^{3} x ^{2} + 1 + 8 y ^{4} x ^{2} + 6 y ^{2} x ^{2} + x ^{2} + 4 y ^{4} x x ^{2} + 1 + 2 y ^{2} x x ^{2} + 1 + y ^{4}}{8 y ^{2} x ^{4} + 8 y ^{2} x ^{2} + 4 y ^{2} x x ^{2} + 1 + 8 y ^{2} x ^{3} x ^{2} + 1 + y ^{2}} : y = x, y = - x

y = x, y = - x

Verifique soluções:

y = x {x = 0}, y = - x

Verdadeiro

As soluções são

y = x {x = 0}, y = - x

Gráfico

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x - 8 = x + 4

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sqrt(2x+9)-sqrt(x+1)=sqrt(x+4)

2 x + 9 - x + 1 = x + 4