「ラテックス
\ begin {array} {*{20} c} {x = \ frac {{ -  b \ pm \ sqrt {b^2-4ac}}}} {{2a}}}}＆{{\ rm {when}}}}}}}}＆{ax^2 + bx + c = 0} \\ \ end {array}
`` `
```latex
\begin{array}{*{20}c} {x = \frac{{ - b \pm \sqrt {b^2 - 4ac} }}{{2a}}} & {{\rm{when}}} & {ax^2 + bx + c = 0} \\ \end{array}
```