sorry if this is the wrong section...
im just hoping that someone can verify what i have done here:
sorry i rephrased the question a bit wrong because i was in a hurry
i really meant it to be one of those "i dont understand what i did wrong" type questions
essentially what i was trying to do was to use the triangular inequality in the reverse, to cram the two absolute brackets into one
is anyone able to correct what i have done? or provide an alternative?