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Find the vertex of the parabola:  𝑓(𝑥)=−3𝑥2−36𝑥−4   𝑥= 𝑦=

Question

Find the vertex of the parabola:  𝑓(𝑥)=−3𝑥2−36𝑥−4   𝑥= 𝑦=

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Solution

Para encontrar el vértice de la parábola dada por la función f(x)=3x236x4 f(x) = -3x^2 - 36x - 4 , podemos seguir estos pasos:

  1. Identificar los coeficientes: La ecuación de la parábola está en la forma estándar f(x)=ax2+bx+c f(x) = ax^2 + bx + c , donde a=3 a = -3 , b=36 b = -36 , y c=4 c = -4 .

  2. Calcular la coordenada x x del vértice: La fórmula para la coordenada x x del vértice de una parábola es x=b2a x = -\frac{b}{2a} .

    Sustituyendo los valores de a a y b b : x=362(3)=366=6 x = -\frac{-36}{2(-3)} = \frac{36}{-6} = -6

  3. Calcular la coordenada y y del vértice: Para encontrar la coordenada y y , sustituimos x=6 x = -6 en la función f(x) f(x) .

    f(6)=3(6)236(6)4 f(-6) = -3(-6)^2 - 36(-6) - 4

    Primero, calculamos (6)2 (-6)^2 : (6)2=36 (-6)^2 = 36

    Luego, multiplicamos por 3 -3 : 336=108 -3 \cdot 36 = -108

    Ahora, calculamos 36(6) -36 \cdot (-6) : 36(6)=216 -36 \cdot (-6) = 216

    Finalmente, sumamos todos los términos: f(6)=108+2164=104 f(-6) = -108 + 216 - 4 = 104

  4. Escribir las coordenadas del vértice: El vértice de la parábola es el punto (x,y) (x, y) .

    x=6,y=104 x = -6, \quad y = 104

Por lo tanto, el vértice de la parábola f(x)=3x236x4 f(x) = -3x^2 - 36x - 4 es (x,y)=(6,104) (x, y) = (-6, 104) .

This problem has been solved

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