Directional Derivative of f(x,y,z) = xy + yz

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Multivariable Calculus: Find the directional derivative of the function f(x,y,z) = xy + yz in the direction 2i - 2j + k at the point (1,2,4).

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you remind me of a football coach, but good video and explanation!

bggi
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@MathDoctorBob glad to help :) great videos btw, helped me a lot with my exam today, really well laid out and explained

metaldnbufc
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@dbmuur16 Glad to help! If you have any questions, let me know. - Bob

MathDoctorBob
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@dbmuur16 With the constraint, it sounds like a Lagrange multiplier problem. Does that sound familiar? - Bob

MathDoctorBob
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@metaldnbufc Good eyes! Thanks for letting me know! - Bob

MathDoctorBob
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your title says xz+yz but you have differentiated xy+yz

metaldnbufc
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@metaldnbufc Thanks and good luck with exams! - Bob

MathDoctorBob