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What is the equation of the tangent to the curve:𝑦=2𝑥3+𝑥2y=2x 3 +x 2 y, equals, 2, x, cubed, plus, x, squaredat the point where 𝑥=2x=2x, equals, 2?

Question

What is the equation of the tangent to the curve:𝑦=2𝑥3+𝑥2y=2x 3 +x 2 y, equals, 2, x, cubed, plus, x, squaredat the point where 𝑥=2x=2x, equals, 2?

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Solution

Para encontrar la ecuación de la tangente a la curva y=2x3+x2 y = 2x^3 + x^2 en el punto donde x=2 x = 2 , sigue estos pasos:

  1. Encuentra el valor de y y en x=2 x = 2 : y=2(2)3+(2)2=28+4=16+4=20 y = 2(2)^3 + (2)^2 = 2 \cdot 8 + 4 = 16 + 4 = 20 Entonces, el punto de tangencia es (2,20) (2, 20) .

  2. Calcula la derivada de y y con respecto a x x para encontrar la pendiente de la tangente: dydx=ddx(2x3+x2)=6x2+2x \frac{dy}{dx} = \frac{d}{dx}(2x^3 + x^2) = 6x^2 + 2x

  3. Evalúa la derivada en x=2 x = 2 para encontrar la pendiente en ese punto: dydxx=2=6(2)2+2(2)=64+22=24+4=28 \frac{dy}{dx} \bigg|_{x=2} = 6(2)^2 + 2(2) = 6 \cdot 4 + 2 \cdot 2 = 24 + 4 = 28 Entonces, la pendiente de la tangente en x=2 x = 2 es 28.

  4. Usa la fórmula de la recta tangente yy1=m(xx1) y - y_1 = m(x - x_1) , donde m m es la pendiente y (x1,y1) (x_1, y_1) es el punto de tangencia: y20=28(x2) y - 20 = 28(x - 2)

  5. Simplifica la ecuación para obtener la forma explícita de la tangente: y20=28x56 y - 20 = 28x - 56 y=28x56+20 y = 28x - 56 + 20 y=28x36 y = 28x - 36

Por lo tanto, la ecuación de la tangente a la curva en el punto donde x=2 x = 2 es: y=28x36 y = 28x - 36

This problem has been solved

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