This expression can not be factored because on writing 4 as `2^2`, you get

`x^4 + 2^2`

and the above expression is not a difference of two squares and neither any of factor-able expressions as mentioned in this post.

`x^4 + 2^2`

and the above expression is not a difference of two squares and neither any of factor-able expressions as mentioned in this post.

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