Math Chapter Wise Tangent, Normal, Increasing, Decreasing And Maxima/Minima Of A Function Of One Variable English MCQ PGT 2004 Q.If f(x) = x5 - 20x3 + 240x, then f(x) is Amonotonically, decreasing everywhere Bmonotonically, decreasing only in (0,∞) Cmonotonically, increasing everywhere Dmonotonically, increasing only in(0,∞) Show answer Correct answer: monotonically, increasing everywhere