What are the roots of the polynomial equation:

(x + 5) (x + 5i) (x - 5i) = 0

Enter your answers in order from least to greatest, separated by a comma.

Set each factor equal to 0 and solve for x

x+5 = 0 leads to x = - 5

x+5i = 0 leads to x = - 5i

x-5i = 0 leads to x = 5i

The three roots are: - 5, - 5i, 5i

Side note: it is not possible to order complex numbers in the form a+bi where 'b' is nonzero. Only purely real numbers can be ordered.