Question

умоляю помогите пж пж

Answer 1

1) (x-y)(x+y) + (x-y) = (x-y)(x+y+1)

2) $(2x-y)^{2} - 9 = (2x-y-3)(2x-y+3)$

3)$c^{4} (a-1) - c^{2} (a-1) = (a-1)(c^{4} - c^{2}) = (a-1)(c^{2} - c)(c^{2} + c)$

4)$4 - (m^{2} - 2mn +n^{2}) = 4 - (m-n)^{2} = (2-m+n)(2+m-n)$