Replace x^2 with m
Step-by-step explanation:
x^8-3x^4+2=0
We want to write this as a quadratic, which means as am^2+bm +c
x^8 needs to become m^2
Let m = x^4
Then m^2 = x^4^2 = x^8
Our equation becomes
m^2 -3m +2 =0