3х^2-6xm-9m^2 _ разложить на множители
3х^2-6xm-9m^2=3x^2+3xm-9xm-9m^2=3x(x+m)-9m(x+m)=(x+m)(3x-9m)=3(x-3m)(x+m)
3х^2-6xm-9m^2=3(x-3m)(x+m)
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3х^2-6xm-9m^2=3x^2+3xm-9xm-9m^2=3x(x+m)-9m(x+m)=(x+m)(3x-9m)=3(x-3m)(x+m)
3х^2-6xm-9m^2=3(x-3m)(x+m)