- #1
imsoconfused
- 50
- 0
Homework Statement
If |A+B|^2=|A|^2+|B|^2, prove that A is perpendicular to B.
Homework Equations
A^2=|A||A|
The Attempt at a Solution
All I can think of to do is expand the equation to get (A.B)(A.B)=A.A+B.B. I know that iff a.b=0, the two are perpendicular but I can't figure out how to show that because I don't really even understand what the question is asking. I'm in desperate need of some help!