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The domain of 𝑓(𝑥)=1−(𝑥2−6𝑥+5)f(x)= −(x 2 −6x+5)​ 1​ is:A.[1,5][1,5]B.(1, 5)C.Null setD.(−∞,1)∪(5,∞)(−∞,1)∪(5,∞)E.(−∞,1]∪[5,∞)(−∞,1]∪[5,∞)SUBMITarrow_backPREVIOUS

Question

The domain of 𝑓(𝑥)=1−(𝑥2−6𝑥+5)f(x)= −(x 2 −6x+5)​ 1​ is:A.[1,5][1,5]B.(1, 5)C.Null setD.(−∞,1)∪(5,∞)(−∞,1)∪(5,∞)E.(−∞,1]∪[5,∞)(−∞,1]∪[5,∞)SUBMITarrow_backPREVIOUS

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Solution

Para determinar el dominio de la función f(x)=11(x26x+5) f(x) = \frac{1}{1 - (x^2 - 6x + 5)} , debemos asegurarnos de que el denominador no sea igual a cero, ya que la división por cero no está definida.

  1. Primero, simplificamos la expresión en el denominador: 1(x26x+5)=1x2+6x5=x2+6x4 1 - (x^2 - 6x + 5) = 1 - x^2 + 6x - 5 = -x^2 + 6x - 4

  2. Ahora, encontramos los valores de x x que hacen que el denominador sea cero: x2+6x4=0 -x^2 + 6x - 4 = 0

  3. Resolvemos la ecuación cuadrática: x26x+4=0 x^2 - 6x + 4 = 0

  4. Utilizamos la fórmula cuadrática x=b±b24ac2a x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} donde a=1 a = 1 , b=6 b = -6 , y c=4 c = 4 : x=6±36162=6±202=6±252=3±5 x = \frac{6 \pm \sqrt{36 - 16}}{2} = \frac{6 \pm \sqrt{20}}{2} = \frac{6 \pm 2\sqrt{5}}{2} = 3 \pm \sqrt{5}

  5. Los valores de x x que hacen que el denominador sea cero son x=3+5 x = 3 + \sqrt{5} y x=35 x = 3 - \sqrt{5} .

  6. Por lo tanto, el dominio de la función f(x) f(x) es todos los números reales excepto 3+5 3 + \sqrt{5} y 35 3 - \sqrt{5} .

  7. Esto se puede expresar como: (,35)(35,3+5)(3+5,) (-\infty, 3 - \sqrt{5}) \cup (3 - \sqrt{5}, 3 + \sqrt{5}) \cup (3 + \sqrt{5}, \infty)

  8. Comparando con las opciones dadas, la opción correcta es: D.(,1)(5,) D. (-\infty, 1) \cup (5, \infty)

Por lo tanto, la respuesta correcta es la opción D.

This problem has been solved

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