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Popular Álgebra >

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

Solución

resolver para

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

Solución

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

Pasos de solución

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

Desarrollar

(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

Factorizar

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 al cuadrado ambos 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

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

Restar

1

de ambos 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

Desplace

4 y^{2} x^{2}

a la derecha

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}

Desplace

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

a la derecha

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

Desplace

2 y^{2}

a la derecha

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}

Desplace

2 x^{2}

a la derecha

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}

Desplace

2 x x^{2} + 1

a la derecha

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

Restar

- 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 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

Factorizar

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 lados entre

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

Desplace

2 x^{2} y^{2}

a la derecha

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}

Desplace

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

a la derecha

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

Desplace

y^{2}

a la derecha

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}

Desplace

x^{2}

a la derecha

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}

Desplace

x x^{2} + 1

a la derecha

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

Factorizar

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 lados entre

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 al cuadrado ambos lados:

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

Verificar las soluciones:

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

Verdadero

Las soluciones son

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

Gráfica

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