2. (4 puntos) Halle los valores de las constantes a, b y c tales que la derivada direccional de $f(x,y,z) = axy^2 + byz + cz^2x^3$, en el punto P (1, 2, -1) tenga valor máximo de 64 en la dirección paralela al eje z.
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The gradient of $f$ is given by: $\nabla f = \left(\frac{\partial f}{\partial x}, \frac{\partial f}{\partial y}, \frac{\partial f}{\partial z}\right) = (ay^2 + 3cz^2x^2, 2axy + bz, by + 2czx^3)$ Show more…
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