This cubic equation is from Brilliant x^3-3x^2-3x-1=0 . Check out their courses to learn more about algebra, cubic equations, and Lagranges Resolvent via this link [ Ссылка ] That link also gives you a 20% discount on their annual premium subscription. Thanks for checking it out.

Hello, 0:00
First way: 0:56
Second way: 3:36

Thanks to Christopher Musso
1:59 - "three square root of X"
2:08 - "three square root of 2"
Should have said "cube root of 2" for both instances.

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