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= 25u^2-20uy-20uy+16y
= 25u^2+16y
2) 2a-5-8a+4 a=0
-6a-1=0
-6a=1
a=-1/6
3)-
4) 3u^2 + 2uy + y^2 - 2u^2 - 3y^2 +5y
u^2-2y^2+2uy+5y
5)-