1) b^2-0,36 = (b-0,6)(b+0,6)
2) y^2-6y+9=(y-3)^2
1) 5(4-9x^2y^2) = 20 - 45x^2y^2
2) a^6 - 2 a^3b^2 + b^4
3) x^2 + 2xy + y^2 - (x^2 - 2xy + y^2) = x^2 + 2xy + y^2 - x^2 + 2xy - y^2 = 4xy
1) b^2-0,36 = (b-0,6)(b+0,6)
2) y^2-6y+9=(y-3)^2
1) 5(4-9x^2y^2) = 20 - 45x^2y^2
2) a^6 - 2 a^3b^2 + b^4
3) x^2 + 2xy + y^2 - (x^2 - 2xy + y^2) = x^2 + 2xy + y^2 - x^2 + 2xy - y^2 = 4xy