Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §13.4 Directional Derivatives and Gradients, #49 · Multivariable Calculus · Gradient & optimization

If … and grad … at the point …, find the tangent…

If $f = 1$ and grad $f = (2, 3)$ at the point $(4, 5)$ , find the tangent plane at $(4, 5)$ . If $f$ is a linear function, find $f (x, y)$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §13.4 Directional Derivatives and Gradients, #49

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