Hi,

f(x)=x^4+13x^2+36    || Let X = x^2

f(X) = X^2 + 13X + 36









   X = -9 or X = -4

   x^2 = -9

   x = ± 3i

   x^2 = -4

   x = ± 2i

D) f(x)=(x+2i)(x-2i)(x+3i)(x-3i) 

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