How to quickly solve a quadratic equation

[MattH]

I came across Carl's tutorial on CAS solve() which has really helped me out.

https://docs.google.com/document/d/1eTfT...OffKb4/pub

Only problem is that I'd really like to use the proot() command but when I do I get a really weird answer compared the the x-intercepts that Carl gets when he does it in example 2 of the tutorial. Any idea why that is?

I put a screen capture in an attachment.