I forgot how to do cubic equations please help
2x^3 + x^2 - 18x - 9 = 0
Thanks in advance
and Jhevon used, though probably the majority that you will meet on low
level HS and University maths courses will be. The usual way of solving them
is numerically, and if we are feeling adventurous using Ferro-Tartaglia-Cardano method.
Note a cubic with real coefficients always has at least one real root/factor