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Vieta's theorem is explained - direct and inverse. The definition of a reduced quadratic equation is given. The method of selecting the roots of a quadratic equation using Vieta's theorem is analyzed in detail. Several standard problems on the application of Vieta's theorem are solved. If you liked the lesson and want to support the channel financially, then the card numbers are: 5457 0822 2777 7054 5168 7451 0858 1155 If you do not have such an opportunity, then just thank you for watching my video lessons.