Find ||2w-v|| from <v,w>=-3, ||v||=2, ||w||=7

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SUMMARY

The discussion focuses on calculating the expression ||2w - v|| given the inner product = -3, ||v|| = 2, and ||w|| = 7. Participants concluded that the expression evaluates to ||2w - v|| = √212. This confirms that the calculation is correct based on the provided values.

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DavidLiew
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How to find a ||2w-v||,by giving <v,w> = -3, ||v||=2 and ||w||= 7.

Actually I find that it was undefined, I not sure its correct or not, so I need yours to help me thanks.:shy:
 
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Finally I find it is equal to \sqrt{212}. Am I right?
 
DavidLiew said:
Finally I find it is equal to \sqrt{212}. Am I right?

I got the same answer.
 

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