test1.md

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

Line starts from $$

$$N = \sum_{n=1}^r x_n$$

$$N = \sum_{n=1}^r x_n$$

(Converted to <script type="math/tex"> by Jekyll)

Line does not start from $$

test: $$N = \sum_{n=1}^r x_n$$

test: $$N = \sum_{n=1}^r x_n$$

(Converted to <script type="math/tex; mode=display"> by Jekyll)

Use script type math/tex

<script type="math/tex">ax+by+c=0</script>

<script type="math/tex; mode=display">\sum_{i=1}^n x_i</script>