1) 9y^2 - 25 = (3y + 5)(3y - 5)2) 4a - a^3 = a(4 - a^2) = a(2 + a)(2 - a)3) -2a^2 + 4ac - 2c^2 = -2(a - c)^2
1) 9y^2 - 25 = (3y + 5)(3y - 5)
2) 4a - a^3 = a(4 - a^2) = a(2 + a)(2 - a)
3) -2a^2 + 4ac - 2c^2 = -2(a - c)^2