Question

Answer 1

=y(x+2)-(x+2)(x-2)

=(x+2)(y-x+2)

Answer 2

để mình làm rõ hơn cko

\(=\left(xy+2y\right)+\left(4-x^2\right)\\= \left(xy+2y\right)+\left(2-x\right)\left(2+x\right)\\ =y\left(x+2\right)+\left(2-x\right)\left(x+2\right)\\ =\left(x+2\right)\left(y+2-x\right)\)