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Let  u and w be complex numbers such that:

|u| = 5, |w| = 3, |u+w| = 6

Calculate  |u+2w| with proof.

 Aug 20, 2020
 #1
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Using the cosine law, I worked out that |u + 2w| = sqrt(47).

 Aug 20, 2020
 #2
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can you explain how you got this?

Guest Aug 21, 2020
 #3
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As follows:

 Aug 21, 2020
 #4
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um this was blocked by the moderator...

Guest Aug 22, 2020

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