Re: Plot results not right

*To*: mathgroup at smc.vnet.net*Subject*: [mg89921] Re: Plot results not right*From*: Helen Read <hpr at together.net>*Date*: Tue, 24 Jun 2008 03:31:27 -0400 (EDT)*References*: <g3nhbc$g6$1@smc.vnet.net>*Reply-to*: HPR <read at math.uvm.edu>

BrenB wrote: > I'm new to Mathematica. > > I'm studying Calculus, and I'm trying to reproduce, in Mathematica, > the graph results of an equation in my book. > > Plot[2 x - 3 x^(2/3) + 4, {x, -1, 6}] > > The output graph is correct, except there should be graphing in the > 2nd and 3rd quadrant, and there is none. The trouble is that Mathematica by default returns a complex root (in this case cube-root) of a negative number. > Is there another way to enter this equation into Mathematica to get > the correct graph results? This will work. Plot[2 x - 3 (x^2)^(1/3) + 4, {x, -1, 6}] -- Helen Read University of Vermont