f(x) = x^2 (x^2 - 4) (x^2 + 3)

f(x) = x^2 ( x - 2 ) ( x + 2 ) ( x^2 + 3 )

Real roots are :

x = 0 with multiplicity 2

x = 2 with multiplicity 1

x = -2 with multiplicity 1

( x^2 + 3 ) does not have real roots.

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