9780070109100, Chapter 13 2, Problem 1E

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Chapter 13.2, Problem 1E Step-by-step solution Step 1 of 1 1. Since and x2 are both nonzero, we may disregard (13.20), but (13.21) requires that: and The first inequality is automatically satisfied at the solution, and the second means that dx1 with dx2 free. Thus we may admit as a test vector, say (dx1, dx2) = (1, 0), which plots as an arrow pointing eastward from the solution point in Fig. 13.5. No qualifying arc can be found for this vector.