Question

разложить на множители 3x^2-6xm-9m^2

Answer 1

3x^2-6xm-9m^2=

=4х^2 - (x^2 + 6mx + 9m^2)=

=4x^2 - (x + 3m)^2=

=(2x-x-3m)(2x+x+3m)=

=(x-3m)(3x+3m)=

3(x-3m)(x+m)