Before attempting this problem, solve version 1: https://www.mathworks.com/matlabcentral/cody/problems/2510-solving-quadratic-equations-version-1.
In this version, the discriminant can have any value. Complete the function so if the discriminant is negative, the function returns values of NaN --- "Not a Number" --- for x1 and x2. Otherwise, the function computes x1 and x2 as before using the formula
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