Question

solve x^3- 3x-9 = 0​

Answer 1

Answer:

x^3-3x-8=0

=⟩x×x×x-3x-9=0

=⟩x×x×x-3x=0+9=9

=⟩x×x×x×x=9+3

=⟩4x=12

=⟩x=12/4

=⟩x=3