You sound just like my professor "problem done wrong, plane go boom"
The question was:
"Let R^3 have the Euclidian inner product, and suppose u = (1, 1, -1) and v = (6, 7, -15). Find a value for k which ||ku + v|| = 13."
I pretty much did it in my head cause so easy then just showed that my K worked when you calculated the norm.
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