(5x - 2y)(5x + 2y)
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The answer to x2 - 2x - 4y2 - 4y =(x - 2y)(x - 2y - 2)
This is a difference of two squares, which factorises to: (3x - 4y)(3x + 4y)
All you can do to factor that expression is to divide both terms by y: y2 + 4y = y(y + 4)
7(3y-2)-(-4y+9)
25x+20y=5x(5+4y)