Question: Difficulty plotting (x^(5/3)-5*x^(2/3))

Hello folks, i recently had really confusing times when i plotted the function (x^(5/3)-5*x^(2/3)) in maple 2016. I know how this graph looks like as i have it printed in my undergraduate textbook. But in maple i'm not getting function(above given) values plotted for negative numbers. When i evaluate the function for x=-1 i'm getting some complex numbers, when i'm supposed to have simply -6. Could anybody tell me what's going on?plot(x^(5/3)-5*x^(2/3))

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