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Given P(x) = x4+ ax3 + cx + d such that x = 0 is the only real root of P′ (x) = 0. If P(–1) < P(1),then in the interval [–1, 1].
P(–1) is the minimum and P(1) is the maximum of P
P(–1) is not minimum but P(1) is the maximum of P
P(–1) is the minimum but P(1) is not the maximum of P
neither P(–1) is the minimum nor P(1) is the maximum of P
