Thread: Need math help
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Old 10-05-2012, 04:25 PM   #11
217Bimmer
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Join Date: May 2008
Location: IL
Posts: 146
My Ride: 2001 BMW 330i
x^2=81
x=9
81-9=72
72=(x+y)*(x-y)=x^2-y^2
72=81-y^2
y^2=9
y=3
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