Factorize `x^4+4` – InterviewSolution

1.	Factorize `x^4+4`
Answer» `=> x^4 +4` `(x^2)^2 + (2)^2` `= (x^2)^2 + (2)^2 + 2(x^2)2 - 2(x^2)2` `= (x^2 +2)^2 - (2x)^2 ` using `(a+b)^2 = a^2 + b^2` now by using `a^2 - b^2 = (a+b)(a-b) ` `= (x^2 +2+2x)(x^2+2-2x)` answer

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