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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