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Let f (x) is a 3rd degree polynomial such that f (x2) = 0 has exactly four distinct real roots, then

(A) f (x) = 0 has all three real roots
(B) f (x) = 0 has exactly 2 real roots
(C) f (x) = 0 has only one real root
(D) none of these


F(x^2) has exactly 4 of its 6 roots real and distinct. this means that 2 roots of f(x) are real and non-negative.
0 0 0
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