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(-1)^(2/3) is a math four error... why? - Texas Instruments TI-81 Calculator

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At first, (-1)^(2/3)=1. See captured image


(-1)^(2/3) is a math four error... why? - 3_16_2012_6_22_00_pm.jpg


For better understanding this problem noticed the graph of the function y=x^(2/3) below


3_16_2012_6_26_10_pm.jpg

Posted on Mar 16, 2012

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This is because you cannot put -1 in a square root.
Which is essentially what you do when you put something in a fraction.
First raise the -1 to the 3rd and then try and find the square root of the number.

Posted on Jun 15, 2011

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