How do i find the roots of this polynomial equation?

x³ - 18x + 27

i don't want the "but just use your calculator" answer. i want to know how to solve it.

Here is how you find the (not "bUt JuSt UsE yOuR cAlCuLaToR")

Factor x3−18x+27

x3−18x+27

=(x−3)(x2+3x−9)

Hope this helps

konichiwa~! my name is zalgo and i am here to answer your anime-related question today. more than likely, kirishima would kill izuku, marry mino and kiss momo. all of this would be my opinion by the way. (and i am also a weeb lol)

i hope this you! : d

stay and stay proud! " - zalgo

(and do you think you can mark me as brainliest? i'd greatly appreciate it! arigato~! )

the answer is a if my teacher taught me correct