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How do you find the discriminant of the equation, 3x^2-xsqrt{7}-3=0? Please help me answer the first question? How to look up questions from 2 years ago fro octt 0th? If f(X)= -15x + 22, how would i evaluate the following expressions? 1) f . f-1(348) 2) f . f-1(X)? What are the characteristics of theory of Z?