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Exercise 1.2.9

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If $v_{2} w_{2} ∕ v_{1} w_{1} = - 1$ then $v_{2} w_{2} = - v_{1} w_{1}$ or $v_{1} w_{1} + v_{2} w_{2} = v \cdot w = 0$ : perpendicular! The vectors $(1, 4)$ and $(1, - \frac{1}{4})$ are perpendicular.

mathchakra

2021-11-20 14:04

Exercise 1.2.9

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