a)
w(x) = (x^2 + 3x- 4)(2 - x^2)
w(x)=-(x^2-2)(x^2+4x-x-4)
w(x)=-(x-\sqrt2)(x+\sqrt2)[x(x+4)-(x+4)]
w(x)=-(x-\sqrt2)(x+\sqrt2)(x+4)(x-1)
x_1=\sqrt2 , x_2=-\sqrt2 , x_3=-4 , x_4=1 pierwiastki 1-krotne
b)
w(x) = (x^2 - 3x- 4)(1 - x^2)
w(x)=-(x^2-1)(x^2-4x+x-4)
w(x)=-(x-1)(x+1)[x(x-4)+(x-4)]
w(x)=-(x-1)(x+1)(x-4)(x+1)
w(x)=-(x+1)^2(x-1)(x-4)
x_1=-1 pierwiastek 2-krotny
x_2=1 p. 1-krotny
x_3=-4 p. 1-krotny