# Inner product(norm)

1. Mar 29, 2010

### DavidLiew

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:

2. Mar 29, 2010

### DavidLiew

Finally I find it is equal to $$\sqrt{212}$$. Am I right?

3. Mar 29, 2010

### jbunniii

I got the same answer.

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