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

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

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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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|
It's not technically on the problem itself, but why is there a minus sign for one of the answers?
On the 2nd drawing, those are my answers, but the solution has put a minus sign on one of the solution (3rd picture).

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Like if I leave the answer as the 2nd picture (it will probably be uncorrect).
lol idk wait ill get some help @toxicsugar22 @mathmate @fantasiablueskys
or get half credit*
You understand my question now right? Just checking lol
yeah i dont get it
hint: \((cos\theta-1) = -(1-cos\theta)\)

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