Question

the difference of 2x and y (y 2x)

Answer 1

$2x - y(2xy) \\ = 2x - 2x {y}^{2} \\ = 2x(1 - {y}^{2} ) \\ = 2x(1 - y)(1 + y) \: (using \: {a}^{2} - {b}^{2} = (a + b) (a - b))$