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Completinga^2-8a+15=0 complete the square
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5 votes
Completing
a^2-8a+15=0 
complete the square

User MarkF
by
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1 Answer

5 votes

a^2-8a+15=0\\ a^2-8a+16-1=0\\ (a-4)^2=1\\ a-4 =1 \vee a-4=-1\\ a=5 \vee a=3
User Froskoy
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