Solve-for-x-x-3-7x-2-0-

Question Number 192898 by Red1ight last updated on 30/May/23

Solve for x

x^{3} - 7 x - 2 = 0

Commented by Frix last updated on 30/May/23

You need the T r i g o n o m e t r i c S o l u t i o n to

get exact solutions :

x_{1} = - \frac{2 \sqrt{21}}{3} \cos \frac{π + {2 \sin}^{- 1} \frac{3 \sqrt{21}}{49}}{6} \approx - 2.48928857

x_{2} = - \frac{2 \sqrt{21}}{3} \sin \frac{\sin^{- 1} \frac{3 \sqrt{21}}{49}}{3} \approx - . 289168535

x_{3} = \frac{2 \sqrt{21}}{3} \sin \frac{π + \sin^{- 1} \frac{3 \sqrt{21}}{49}}{3} \approx 2.77845712

Facebook Tweet Pin