Regarding [tex]\displaystyle{\frac{-b \pm \sqrt{b^2 - 4ac}}{2a}}[/tex](adsbygoogle = window.adsbygoogle || []).push({});

How should "[tex]\displaystyle{\pm}[/tex]" be treated?

I know a square root can be both possitive and negative, but does the quardratic forumla dictate that a possitive root should be added to -b, or does it dictate that a postive root should be subtracted from -b???

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# Quadratic formula

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