Question

x^4+x^2+1 factorise​

Answer 1

x^4+x^2+1

= (x^2)^2 + 2.x^2.1 + (1)^2 - x^2

= (x^2 + 1)^2 - (x)^2

= (x^2 + 1 + x) (x^2 + 1 - x)