25x2 - 10xy + y2 = (5x - y)2
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(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)
y2=-x2-8x+6