Question

пж помагите срочно 225)

Answer 1

1) (x+y)(x-y)=x^2-y^2
2) (m-n)(m+n)=m^2-n^2
3) (x+3)(x-3)= x^2-9
4) (2x-1)(2x+1)= 4x^2-1
5) (a-3b)(a+3b)=a^2-9b^2
6) (8c+9d)(9d-8c)=64c^2-81d^2