Question

Factorise: x^4 + 4. ​

Answer 1

Step-by-step explanation:

x^4+4

to factorise we have to add and subtract 4x^2

now

x^4 +4x^2-4x^2+4

x^2(x^2+4)(x^2+4)

(x^2+4) ( x^2+4)

now one by one solving

x^2=-4. x^2=+4

x=√-4. x=√4

hence , ur ans is +-√4