1. Jan 18, 2014

### Coco12

Lets say I was trying to figure out the restrictions of a radical equation and the function inside the radical was a cubic function. I know you have to make the equation inside greater than or equal to 0.
In the case of a quadratic equation, you have to square root it once you bring everything to one side of the equality, giving you a positive and negative answer, is this the same for cube rooting it when figuring out the restrictions? You will have a positive and negative cube root?

2. Jan 18, 2014

### Staff: Mentor

3. Jan 18, 2014

### HallsofIvy

No. $(-x)^3= -x^3$ so there are not "positive and negative cube roots" of the same number. There will be one real cube root of a real number (other than 0) and two complex conjugate (non-real) roots.

4. Jan 18, 2014

### Coco12

Ok thank you

5. Jan 18, 2014

### SteamKing

Staff Emeritus