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?
Solution
Para resolver el problema, sigamos los siguientes pasos:
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Encontrar la derivada de la función : La derivada de con respecto a es:
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Calcular la pendiente de la tangente en el punto : Sustituimos en la derivada:
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Ecuación de la tangente en el punto : La ecuación de la recta tangente en un punto con pendiente es: Sustituimos , y :
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Simplificar la ecuación de la tangente:
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La tangente pasa por el origen : Sustituimos y en la ecuación de la tangente:
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Resolver para :
Por lo tanto, el valor de es .
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