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The tangent to the curve with equation:𝑦=𝑥2+2𝑥y=x 2 +2xy, equals, x, squared, plus, 2, xat the point (𝑏,𝑏2+2𝑏b,b 2 +2bb, comma, b, squared, plus, 2, b) passesthrough the origin.What is the value of 𝑏bb?

Question

The tangent to the curve with equation:𝑦=𝑥2+2𝑥y=x 2 +2xy, equals, x, squared, plus, 2, xat the point (𝑏,𝑏2+2𝑏b,b 2 +2bb, comma, b, squared, plus, 2, b) passesthrough the origin.What is the value of 𝑏bb?

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Solution

Para resolver el problema, sigamos los siguientes pasos:

  1. Encontrar la derivada de la función y=x2+2x y = x^2 + 2x : La derivada de y y con respecto a x x es: dydx=2x+2 \frac{dy}{dx} = 2x + 2

  2. Calcular la pendiente de la tangente en el punto (b,b2+2b)(b, b^2 + 2b): Sustituimos x=b x = b en la derivada: dydxx=b=2b+2 \frac{dy}{dx} \bigg|_{x=b} = 2b + 2

  3. Ecuación de la tangente en el punto (b,b2+2b)(b, b^2 + 2b): La ecuación de la recta tangente en un punto (x1,y1)(x_1, y_1) con pendiente m m es: yy1=m(xx1) y - y_1 = m(x - x_1) Sustituimos x1=b x_1 = b , y1=b2+2b y_1 = b^2 + 2b y m=2b+2 m = 2b + 2 : y(b2+2b)=(2b+2)(xb) y - (b^2 + 2b) = (2b + 2)(x - b)

  4. Simplificar la ecuación de la tangente: yb22b=(2b+2)x(2b+2)b y - b^2 - 2b = (2b + 2)x - (2b + 2)b yb22b=(2b+2)x2b22b y - b^2 - 2b = (2b + 2)x - 2b^2 - 2b y=(2b+2)x2b22b+b2+2b y = (2b + 2)x - 2b^2 - 2b + b^2 + 2b y=(2b+2)xb2 y = (2b + 2)x - b^2

  5. La tangente pasa por el origen (0,0)(0, 0): Sustituimos x=0 x = 0 y y=0 y = 0 en la ecuación de la tangente: 0=(2b+2)0b2 0 = (2b + 2) \cdot 0 - b^2 0=b2 0 = -b^2

  6. Resolver para b b : b2=0 b^2 = 0 b=0 b = 0

Por lo tanto, el valor de b b es 0 0 .

This problem has been solved

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