Question

36x^2-25y^2=
а^2 b^2-9=
9a^2-81x^2=
x^2-c^2 y^2=

Answer 1

1) (6x-5y)(6x+5y)
2)(ab-3)(ab+3)
3)(3a-9x)(3a+9x)
4)(x-cy)(x+cy)