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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §13.6 Maxima, Minima, and Saddle Points, #25 · Multivariable Calculus · Gradient & optimization

(a) Maximize … on the circle

(a) Maximize $f = a x + b y$ on the circle $x^{2} + y^{2} = 1$ .
(b) Minimize $x^{2} + y^{2}$ on the line $a x + b y = 1$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §13.6 Maxima, Minima, and Saddle Points, #25

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