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Mathematics 25 Online
OpenStudy (shaleiah):

medal and fan

OpenStudy (mathmath333):

for second the formula is (a+b)^2=a^2+2ab+b^2, (n+2)^2-4=n^2+4n+4-4=n^2+4n

OpenStudy (shaleiah):

#1?

OpenStudy (anonymous):

sorry i'm not good at this

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