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If g(x)= ๐‘ฅ๐‘ฅ+1x+1xโ€‹ then the inverse function g - 1(x) =A.๐‘ฅ+1๐‘ฅxx+1โ€‹ B.xC.๐‘ฅ1โˆ’๐‘ฅ1โˆ’xxโ€‹ D.๐‘ฅโˆ’1๐‘ฅxxโˆ’1โ€‹ E.๐‘ฅ๐‘ฅ+1x+1xโ€‹ SUBMITarrow_backPREVIOUS

Question

If g(x)= ๐‘ฅ๐‘ฅ+1x+1xโ€‹ then the inverse function g - 1(x) =A.๐‘ฅ+1๐‘ฅxx+1โ€‹ B.xC.๐‘ฅ1โˆ’๐‘ฅ1โˆ’xxโ€‹ D.๐‘ฅโˆ’1๐‘ฅxxโˆ’1โ€‹ E.๐‘ฅ๐‘ฅ+1x+1xโ€‹ SUBMITarrow_backPREVIOUS

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Solution

Para encontrar la funciรณn inversa gโˆ’1(x) g^{-1}(x) de g(x)=xx+1 g(x) = \frac{x}{x+1} , sigamos estos pasos:

  1. Empezamos con la ecuaciรณn y=xx+1 y = \frac{x}{x+1} .
  2. Intercambiamos x x y y y para encontrar la inversa: x=yy+1 x = \frac{y}{y+1} .
  3. Resolvemos para y y : x(y+1)=yโ€…โ€ŠโŸนโ€…โ€Šxy+x=yโ€…โ€ŠโŸนโ€…โ€Šxyโˆ’y=โˆ’xโ€…โ€ŠโŸนโ€…โ€Šy(xโˆ’1)=โˆ’xโ€…โ€ŠโŸนโ€…โ€Šy=โˆ’xxโˆ’1 x(y + 1) = y \implies xy + x = y \implies xy - y = -x \implies y(x - 1) = -x \implies y = \frac{-x}{x - 1}

Por lo tanto, la funciรณn inversa es gโˆ’1(x)=โˆ’xxโˆ’1 g^{-1}(x) = \frac{-x}{x - 1} .

Comparando con las opciones dadas: A. x+1x \frac{x+1}{x} B. x x C. x1โˆ’x \frac{x}{1-x} D. xโˆ’1x \frac{x-1}{x} E. xx+1 \frac{x}{x+1}

La opciรณn correcta es: C. x1โˆ’x \frac{x}{1-x}

Sin embargo, parece que hay un error en la simplificaciรณn. Revisemos:

  1. x=yy+1 x = \frac{y}{y+1}
  2. x(y+1)=y x(y + 1) = y
  3. xy+x=y xy + x = y
  4. xyโˆ’y=โˆ’x xy - y = -x
  5. y(xโˆ’1)=โˆ’x y(x - 1) = -x
  6. y=โˆ’xxโˆ’1 y = \frac{-x}{x - 1}

Revisando nuevamente, parece que la opciรณn correcta no estรก listada. La inversa correcta es gโˆ’1(x)=โˆ’xxโˆ’1 g^{-1}(x) = \frac{-x}{x - 1} , que no coincide con ninguna de las opciones proporcionadas.

This problem has been solved

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