Question 918757
x^2(x^4+16)=8x^4
(x^2(x^4+16))/x^2=8x^4/x^2
x^4+16=8x^2
x^4-8x^2+16=0
((x^2-4)(x^2-4))=0
((x^2-4)(x^2-4))/(x^2-4)=0/(x^2-4)
x^2-4=0
x^2=4
x=+-2