What substitution should be used to rewrite x^8-3x^4+2=0 as a quadratic equation​? u = x^2
u = x^4
u = x^8
u = x^16

Idon’t know what the answer is i wish i could

1. statement- ca is parallel to db and e is the midpoint of ad reason- given2. statement- reason- alternate interior angles3. statement- de is congruent to ae reason- definition of midpoint4. statement- triangle aec is congruent to triangle deb reason- asa (angle side angle)