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# Magnitude of vector question

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1. I have a vector question that I have no clue how to solve. Any help you guys could give would be amazing!

Given that a.b = 5 and a.(a+b) = 54, find the magnitude of |a|
2. (Original post by LewisG_)
I have a vector question that I have no clue how to solve. Any help you guys could give would be amazing!

Given that a.b = 5 and a.(a+b) = 54, find the magnitude of |a|
3. (Original post by LewisG_)
I have a vector question that I have no clue how to solve. Any help you guys could give would be amazing!

Given that a.b = 5 and a.(a+b) = 54, find the magnitude of |a|
since the scalar product is distributive...

a.(a+b) can be written as

a.a + a.b

that should help...
4. (Original post by Zacken)
Thanks, I got it

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