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1.64-b^2
2.35a^2+10ax+x^2
3.49x^2y^2 -36 a^4
4.64y^2 -(a+3)^2
5?64m^12-1

1.64-b^2=(8-b)(8+b) 2.25a^2+10ax+x^2=(5a+x)² 3.49x^2y^2 -36 a^4=(7xy-6a²)(7xy+6a²) 4.64y^2 -(a+3)^2=(8y-a-3)(8y+a+3) 5.64m^12-1=(8m^6-1)(8m^6+1)