## Zenmo one year ago Small question on the "answers" for this rectangular to polar form problem y^2-8x-16=0.

1. Zenmo

Simplifying the problem with the quadratic formula will get me |dw:1433774796671:dw| so I get |dw:1433774862883:dw|, but in the book it's |dw:1433774911588:dw|

2. Zenmo

It's not technically on the problem itself, but why is there a minus sign for one of the answers?

3. Zenmo

On the 2nd drawing, those are my answers, but the solution has put a minus sign on one of the solution (3rd picture).

4. Zenmo

Like if I leave the answer as the 2nd picture (it will probably be uncorrect).

5. anonymous

lol idk wait ill get some help @toxicsugar22 @mathmate @fantasiablueskys

6. Zenmo

or get half credit*

7. Zenmo

You understand my question now right? Just checking lol

8. anonymous

yeah i dont get it

9. mathmate

hint: $$(cos\theta-1) = -(1-cos\theta)$$