# Cubic equation roots

This is a bonus question I'm working on for an exam coming up.

Find the exact root of X^3 + X -1 = f(x). I need to find it in the format:

The exact root of X^2-x-1=0 is x=1+ or - the square root of 5 divided by 2. (Not a decimal or regular fractional number.)

I got all the others, but I just can't get this one.

Â© BrainMass Inc. brainmass.com March 4, 2021, 6:27 pm ad1c9bdddfhttps://brainmass.com/math/basic-algebra/cubic-equation-roots-45608

#### Solution Summary

This shows how to use Cardano's formula to find exact roots of a cubic equation.

$2.49