A-level PM2 Question 3 (Vectors)

Algebra Level 2

Given that the vectors a = 4i - 5j + 9k\textbf{a = 4i - 5j + 9k} and b = 8i + j + λk\textbf{b = 8i + j + λk} are perpendicular, find the value of λλ.

A-level Mathematics Questions Megathread

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