What are the real and complex solutions of the polynomial equation? x4-41x2=-400

For the answer to the question above, I'll provide a solution for my answer below.
x^4 - 41x^2 = - 400 
=> x^4 - 41x^2 + 400 = 0 
=> x^2 = (1/2) [41 ±√(1681 - 100)] 
=> x^2 = (1/2) (41 ± 9) 
=> x^2 = 16 or 25 

So, therefore, the answers for your problem are
=> x = ± 4 or ± 5.

I hope my answer helped you. 

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No solution : there is no number of boxes that she bought