Hi,

f(x) = x^4 + 22x^2 + 21

f(x) = (x^2 + 21)(x^2+1)

 (x^2 + 21)(x^2+1)= 0 ,  

 (x^2 + 21)= 0,  x = ±  

0r(x^2+1)= 0     x = ± i 

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