Identity : Sum of Cubes of Roots of a Cubic Equation | ExamSolutions

Here I show you how to prove the identity for the sum of the cubes of roots of a cubic equation with roots alpha, beta and gamma.

[aishasiddiqui]

Thank a lot for such a wonderful video I was struggling in Further Math (Roots of Polynomial) until I saw this.
once again thanks alot ❤

[buttercup]

i think some of the alphas are meant to be gammas ie. the last line should have (alpha + beta + gamma) not (alpha + beta + alpha)?

[tuneese]

i dont understand why you swapped the addition and subraction sign in the last step. thank you for the video

[asce]

No hate but theres a much easier way to solve this

[thatcommentaccount]

First





Also, it's pronounced *bAYta*. Not Beeta.