9x^4+17х^2-2=0
x^2=t
9t^2+17t-2=0
D=17^2-(4*(-2)*9)=289+72=361
t1=(-17+19)/18=2/18=1/9
t2=-36/18=-2
X^2=1/9
x1=1/3
X^2=-2
1-z^2=0
D=0^2-4*(-1)*1=4
z1=2/(2*(-1))=-1z2=-2/(2*(-1))=1
3z^2-75=0
D=0^2-4*3*(-75)=900
z1=30/(2*3)=30/6=5z2=-30/(2*3)=-30/6=-5
9x^4+17х^2-2=0
x^2=t
9t^2+17t-2=0
D=17^2-(4*(-2)*9)=289+72=361
t1=(-17+19)/18=2/18=1/9
t2=-36/18=-2
X^2=1/9
x1=1/3
X^2=-2
1-z^2=0
D=0^2-4*(-1)*1=4
z1=2/(2*(-1))=-1
z2=-2/(2*(-1))=1
3z^2-75=0
D=0^2-4*3*(-75)=900
z1=30/(2*3)=30/6=5
z2=-30/(2*3)=-30/6=-5