25x2 - 10xy + y2 = (5x - y)2
(y+2)(y+3)
x2 -y2 +4y-4=(x+y)(x-y)+4y-4
4a2 + 4ab - y2 + b2 You cannot simplify this expression because it does not contain like terms, but you can factor it such as: 4a2 + 4ab - y2 + b2 = (4a2 + 4ab + b2) - y2 = (2a + b)2 - y2 = [(2a + b) - y][(2a + b) + y]
All you can do to factor that expression is to divide both terms by y: y2 + 4y = y(y + 4)
This is not factor-able.
25x2 - 10xy + y2 = (5x - y)2
(y+2)(y+3)
(y + 5) (y + 2)
(y + 7)(y + 7)
(y - 5)(y - 6)
(3x - y)(3x - y)
(y - 8)(y - 2)
(y-12)(y-2)
(x2 - xy + y2)(x + y)
(y + 5)(y - 4)
(y - 1)(y - 4)