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Hi guys, I understand how to define reliaibility and validiity regarding experiments but how do you define reliability and validity concerning information? For validity is it how qualified the author of the information is? Im rly confused especially about the validity bit and I have an...

Ex 2.4 q6 is "factorise z^3-1. If z is one of the cube roots of unity, find the two possible values of z^2+z+1. " the solutions do z=1, z^2+z+1=3. Z not equal to 1, z^ +z+1=0. I dont rly understand how the roots of unity relate to the question, can someone explain?