xa^2-xc^2=х(а²-с²)=х(a+с)(а-с)
100m^2-25x^2=25(4m²-x²)=25(2m+x)(2m-x)
a^3-an^2=a(a²-n²)=a(a+n)(a-n)
3x^3-27x=3x(x²-9)=3x(x+3)(x-3)
20x^2-5=5(4x²-1)=5(2x+1)(2x-1)
xa^2-xc^2=х(а²-с²)=х(a+с)(а-с)
100m^2-25x^2=25(4m²-x²)=25(2m+x)(2m-x)
a^3-an^2=a(a²-n²)=a(a+n)(a-n)
3x^3-27x=3x(x²-9)=3x(x+3)(x-3)
20x^2-5=5(4x²-1)=5(2x+1)(2x-1)