Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §13.4 Directional Derivatives and Gradients, #9 · Multivariable Calculus · Gradient & optimization

For … find the steepest direction and the level direction at

For $f = 3 x^{2} + 2 y^{2}$ find the steepest direction and the level direction at $(1, 2)$ . Compute $D_{u} f$ in those directions.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §13.4 Directional Derivatives and Gradients, #9

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