All you can do to factor that expression is to divide both terms by y:
y2 + 4y
= y(y + 4)
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x2 -y2 +4y-4=(x+y)(x-y)+4y-4
7(3y-2)-(-4y+9)
4x-4y-ty+xt = 4x+tx-4y-ty = x(4+t) - y(4+t) = (x-y)*(4+t)
The value of y in the equation -2x plus 4y -4, is 1 plus x/2.
y^3 + y^2 - 6 (y+2) (y-3) i think