Question

x^4 -2x^2 -3 

Сократить 

Answer 1

x^4-2x^2-3=0
x^2=t
t^2-2t-3=0
D=4+12=16
t(1)=(2+4)/2=3
t(2)=(2-4)/2= -1
X^2=3
t^2-2t-3=(t-3)(t+1)
x^4-2x^2-3=(x^2-3)(x^2+1)