Question

1)x^2-81=
2)y^2-6y+9=
3)16x^2-49=
4)9a^2+30ab+25b^2=
Пж помогите​

Answer 1

1) (x-9)(x+9)
2) (y-3)^2
3)(4x-7)(4x+7)
4)(3a+5b) ^2