Using the properties of inner products, we can expand this expression:
$||u+v||^2 = (u+v, u) + (u+v, v) = (u,u) + (v,u) + (u,v) + (v,v)$.
Now, we can substitute the given values:
$||u+v||^2 = (u,u) + (v,u) + (u,v) + (v,v) = ||u||^2 + (u,v) + (v,u) +
Show more…