1) a^2-2a +1=

2)4a^2- 9b^2=

3)x^2-16y^2=

4)9x^2 +6x+1=

5) 25b^2-49x^2=

6)3a^2-12b^2=

7)2x^2+4x+2=

8)a-3b-2a+6b=

9)4a^2-3=

10)x^2+y^2-2xy

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