1)t^4-2t^2-3=0
t=z
t^2-2t-3=0
D=(-2)^2-4*1*(-3)=4+12=16
z1=2+4/2=3
z2=2-4/2=-1
(3.-1)
2) 2x^4-9x^2+4=0
x=t
D=(-9)^-4*2*4=81-32=49
t1=9+7/4=4
t2=9-7/4=1/2
(4.1/2)
1)t^4-2t^2-3=0
t=z
t^2-2t-3=0
D=(-2)^2-4*1*(-3)=4+12=16
z1=2+4/2=3
z2=2-4/2=-1
(3.-1)
2) 2x^4-9x^2+4=0
x=t
D=(-9)^-4*2*4=81-32=49
t1=9+7/4=4
t2=9-7/4=1/2
(4.1/2)