Question

Please answer very urjent!!
Factorise:
x^4 + 4

Answer 1

x^4+2^2=(x^2+2)^2 - 4x

x^4+2^2=(x^2+2+2rootx)(x^2+2-2 rootx)

Answer 2

Answer :-

Factorising :-

$= {x}^{4} + 4 \\ \\ = { ({x}^{2} )}^{2} + {(2)}^{2} \\ \\ = {(a + b)}^{2} + 2ab \\ \\ = {( {x}^{2} + 2)}^{2} + 2( {x}^{2} )(2)$