factor(x^4+1) and partfrac(1/(x^4+1))

10222019, 09:15 AM
Post: #4




RE: factor(x^4+1) and partfrac(1/(x^4+1))
I check out the tests from the document provided by link.
x^4+1=((x(1i)/sqrt(2))*(x(1+i)/sqrt(2)))*((x(1i)/sqrt(2))*(x(1+i)/sqrt(2)))= =(x^2sqrt(2)*x+1)*(x^2+sqrt(2)*x+1) I don't want to get a factorization result over the complex field. The polynomial x^4+1 may be rewriten as a product of polynomials over the field of reals (for example, HP 50g can factorize it). What's wrong with HP Prime's factorization in the real mode in this case? 

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