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#1 Re: Exercises » Perfect square rule » 2006-10-26 14:40:22
x2+8x+16
x2+2x+1
x2-10x+25
x2-x+1/4
36-12x+x2
9x2+30x+25
4y2+40y+100
49x2-28x+4
16y2-24y+9
81x2+144x+64
i did it in 1 min 12 secs. 
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