Completing the square of all real numbers ... i think

Nov 2008
117
0
windsor ont cAN
For question 29
IMG_1311[2].jpg
I don't know where i'm going wrong on it on 2 attempts

first attempt
IMG_1312[1].jpg

second attempt

IMG_1316[1].jpg
 

SlipEternal

MHF Helper
Nov 2010
3,728
1,571
First attempt is correct.
Second attempt: $\sqrt{256} = 16$ not $8\sqrt{2}$.
 
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