x-3-9x-1-0-

Question Number 138835 by mathdanisur last updated on 18/Apr/21

x^{3} - 9 x + 1 = 0

Commented by mr W last updated on 18/Apr/21

x_{k} = 2 \sqrt{3} \sin (\frac{1}{3} \sin^{- 1} \frac{\sqrt{3}}{18} + \frac{2 k π}{3}) k = 0, 1, 2

Commented by mathdanisur last updated on 18/Apr/21

T h a n k S i r

Commented by mathdanisur last updated on 19/Apr/21

W h e r e d i d y o u g e t i t f r o c a n y o u e x p l a i n S i r

Commented by mr W last updated on 19/Apr/21

s e e Q 89687

Commented by Dwaipayan Shikari last updated on 19/Apr/21

C o i n c i d e n c e! s a m e k i n d o f q u e s t i o n a s k e d i n s a m e d a t e s .

O n e y e a r i n t e r v a l!