testing-latex

When $a \ne 0$, there are two solutions to $ax^2 + bx + c = 0$ and they are
$$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$

You should use the math block when typing LaTeX.

When $(a \ne 0)$ , there are two solutions to $(ax^2 + bx + c=0)$ and they are

(this is an inline example)

x = {-b \pm \sqrt{b^2-4ac} \over 2a}

(this is a standalone math block)