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function [F] = f28(x) //f2(x) = 0, with x = [x(1);x(2)] //represents a system of 2 non-linear equations F(1) = x(1)^2+x(1)*x(2) + x(2)^2 - 7; F(2) = x(1)^3+x(2)^3 -9; endfunction