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What is the equation of the normal to the curve:𝑦=2𝑥−1y= 2x−1​ y, equals, square root of, 2, x, minus, 1, end square rootat the point where 𝑥=5x=5x, equals, 5?

Question

What is the equation of the normal to the curve:𝑦=2𝑥−1y= 2x−1​ y, equals, square root of, 2, x, minus, 1, end square rootat the point where 𝑥=5x=5x, equals, 5?

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Solution

Para encontrar la ecuación de la normal a la curva y=2x1 y = \sqrt{2x - 1} en el punto donde x=5 x = 5 , sigue estos pasos:

  1. Encuentra el punto en la curva: Sustituye x=5 x = 5 en la ecuación de la curva para encontrar el valor de y y : y=2(5)1=101=9=3 y = \sqrt{2(5) - 1} = \sqrt{10 - 1} = \sqrt{9} = 3 Entonces, el punto en la curva es (5,3) (5, 3) .

  2. Calcula la derivada de la función: La derivada de y=2x1 y = \sqrt{2x - 1} con respecto a x x es: dydx=ddx(2x1)=122x12=12x1 \frac{dy}{dx} = \frac{d}{dx} (\sqrt{2x - 1}) = \frac{1}{2\sqrt{2x - 1}} \cdot 2 = \frac{1}{\sqrt{2x - 1}}

  3. Evalúa la derivada en x=5 x = 5 : Sustituye x=5 x = 5 en la derivada para encontrar la pendiente de la tangente en ese punto: dydxx=5=12(5)1=19=13 \left. \frac{dy}{dx} \right|_{x=5} = \frac{1}{\sqrt{2(5) - 1}} = \frac{1}{\sqrt{9}} = \frac{1}{3}

  4. Encuentra la pendiente de la normal: La pendiente de la normal es el negativo recíproco de la pendiente de la tangente: mnormal=1(13)=3 m_{\text{normal}} = -\frac{1}{\left( \frac{1}{3} \right)} = -3

  5. Escribe la ecuación de la normal: Usa la fórmula de la recta en forma punto-pendiente yy1=m(xx1) y - y_1 = m(x - x_1) , donde (x1,y1)=(5,3) (x_1, y_1) = (5, 3) y m=3 m = -3 : y3=3(x5) y - 3 = -3(x - 5) Simplifica la ecuación: y3=3x+15 y - 3 = -3x + 15 y=3x+18 y = -3x + 18

Entonces, la ecuación de la normal a la curva en el punto donde x=5 x = 5 es: y=3x+18 y = -3x + 18

This problem has been solved

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