What is the magnitude of -2a - 3b when a=3i+9j and b=4i-6j?

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asked Sep 28, 2021 26.5k views

1 Answer

Muhy · Answer 1 · 2021-10-02T11:48:27+0000

Answer: Dot product of the 2 vectors = 0. Therefore cos x = 0 where j is the angle between the 2 vectors. S0 j = 90°... I believe.