Captured On [2020-02-06 Thu 12:57] Source Session 40: Proof of Lagrange Multipliers | Part C: Lagrange Multipliers and Constrained Differentials | 2. Partial Derivatives | Multivariable Calculus | Mathematics | MIT OpenCourseWare 1 Chalkboard Figure 1: Why this method is valid? Figure 2: Tangent to contrained level curve Figure 3: Both gradient vector are parallel Figure 4: Warning: Can’t use second derivatives Figure 5: Compare values at \(f\)