SOLUTION: the question show v(u-4)= the answer is 8, but how do I know it is 8. I don't see that. Can you show me?

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Question 626233: the question show v(u-4)= the answer is 8, but how do I know it is 8. I don't see that. Can you show me?
Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
you are going to have to include what the function u is. there is not enough info here to proceed