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The following function represents the production cost f(x), in dollars, for x number of units produced by company 1:f(x) = 0.15x2 − 6x + 400The following table represents the production cost g(x), in dollars, for x number of units produced by company 2:x g(x)50 7560 6070 5580 6090 75Based on the given information, determine which company has a lower minimum and find the minimum value. g(x) at (70, 55) f(x) at (20, 340) f(x) at (70, 55) g(x) at (20, 340)

Question

The following function represents the production cost f(x), in dollars, for x number of units produced by company 1:f(x) = 0.15x2 − 6x + 400The following table represents the production cost g(x), in dollars, for x number of units produced by company 2:x g(x)50 7560 6070 5580 6090 75Based on the given information, determine which company has a lower minimum and find the minimum value. g(x) at (70, 55) f(x) at (20, 340) f(x) at (70, 55) g(x) at (20, 340)

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Solution

Para determinar cuál empresa tiene un costo mínimo más bajo y encontrar el valor mínimo, sigamos los siguientes pasos:

  1. Identificar los valores mínimos dados:

    • Para la función g(x) g(x) de la empresa 2, se nos da una tabla con valores específicos. El valor mínimo en la tabla es g(70)=55 g(70) = 55 .
    • Para la función f(x) f(x) de la empresa 1, necesitamos encontrar el valor mínimo de la función cuadrática f(x)=0.15x26x+400 f(x) = 0.15x^2 - 6x + 400 .
  2. Encontrar el valor mínimo de f(x) f(x) :

    • La función f(x)=0.15x26x+400 f(x) = 0.15x^2 - 6x + 400 es una parábola que abre hacia arriba (ya que el coeficiente de x2 x^2 es positivo).
    • El vértice de una parábola ax2+bx+c ax^2 + bx + c se encuentra en x=b2a x = -\frac{b}{2a} .
    • Aquí, a=0.15 a = 0.15 y b=6 b = -6 . Entonces, el vértice está en: x=620.15=60.3=20 x = -\frac{-6}{2 \cdot 0.15} = \frac{6}{0.3} = 20
    • Evaluamos f(x) f(x) en x=20 x = 20 : f(20)=0.15(20)26(20)+400=0.15(400)120+400=60120+400=340 f(20) = 0.15(20)^2 - 6(20) + 400 = 0.15(400) - 120 + 400 = 60 - 120 + 400 = 340
  3. Comparar los valores mínimos:

    • El valor mínimo de g(x) g(x) es 55 en x=70 x = 70 .
    • El valor mínimo de f(x) f(x) es 340 en x=20 x = 20 .
  4. Conclusión:

    • La empresa 2 tiene un costo mínimo más bajo.
    • El valor mínimo es g(70)=55 g(70) = 55 .

Por lo tanto, la empresa 2 tiene el costo mínimo más bajo con un valor de 55 dólares.

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