условие = x^2*(a^2-1) - 3*x*(a^2-1) - 4*(a^2-1)= (a^2-1)*( x^2-3*x-4)=(a^2-1)*(x-4)*(x+1)
a^2*x^2+3x-3a^2*x+4-4a^2-x^2=(a-1)*(a+1)*(x-4)*(x+1)
условие = x^2*(a^2-1) - 3*x*(a^2-1) - 4*(a^2-1)= (a^2-1)*( x^2-3*x-4)=(a^2-1)*(x-4)*(x+1)
a^2*x^2+3x-3a^2*x+4-4a^2-x^2=(a-1)*(a+1)*(x-4)*(x+1)