Can the Proof of a Statement be Improved: A Request for Assistance

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Homework Statement


I would like to ask part (b)

attachment.php?attachmentid=44138&stc=1&d=1329703769.jpg



Homework Equations





The Attempt at a Solution


It seems my proof is not concrete enough. Can anyone help me to improve my proof?

attachment.php?attachmentid=44139&stc=1&d=1329703769.jpg
 

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Hi athrun200,

The coefficients of both √a and √b have to be -4 in the second line. ehild
 

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