Math Chapter Wise Tangent, Normal, Increasing, Decreasing And Maxima/Minima Of A Function Of One Variable English MCQ UP TGT 2021 Q.If x is a real number, then the function f(x) = x3 + x2 + x + 1 has Amaximum value at x = 0 Bminimum value at x = 1 Cmaximum value at x = –1 Dneither maximum nor minimum value Show answer Correct answer: neither maximum nor minimum value