Answer :

Step-by-step explanation:

[tex]x {}^{3} + 36x[/tex]

[tex]x( {x}^{2} + 36)[/tex]

[tex]x(x + 6i)(x - 6i)[/tex]

Set each to zero.

[tex]x = 0[/tex]

[tex]x = - 6i[/tex]

[tex]x = 6i[/tex]

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