mcdragon878 mcdragon878

26-06-2020
Mathematics

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

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Clintonanthony2 Clintonanthony2

26-06-2020

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.

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Help me solve this please