Question

X^4 +4
Factorise
X^4+4
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Answer 1

Answer:

x^4+4

add and subtract 4x^2 we get

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

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

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

as a^2-b^2=(a+b)(a-b)