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What a^2-2a-3=0 by solving equations by completing the square
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What a^2-2a-3=0 by solving equations by completing the square

User Lukas Knuth
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a^2-2a-3=0\\ a^2-2a+1-4=0\\ (a-1)^2=4\\ a-1=-2 \vee a-1=2\\ a=-1 \vee a=3
User Jsegal
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