- #1

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## Main Question or Discussion Point

Hello,

I've got

[tex] |a|^{2} = |a - b + b|^{2} [/tex]

What can I do with this guy? Usually when the square isn't there I use the triangle inequality and things fall out pretty quick, for example,

[tex] |a| = |a - b + b| \leq |a-b| + |b| [/tex]

Is there something like that I can do with the orginial guy?

I've got

[tex] |a|^{2} = |a - b + b|^{2} [/tex]

What can I do with this guy? Usually when the square isn't there I use the triangle inequality and things fall out pretty quick, for example,

[tex] |a| = |a - b + b| \leq |a-b| + |b| [/tex]

Is there something like that I can do with the orginial guy?