# Sample with MathJax contents

$1 3$

Given the quadratic equation $a x 2 + b x + c = 0$ , one of the two roots is given by $x = - b + b 2 - 4 a c 2 a$

Try this.

$\sqrt{\text{49}}$

You should be able to see this inline equation: ${x}^{2}+{xy}^{2}+{xyz}^{2}=0$

The area of a circle is : $\pi {r}^{2}$

${x}^{2}+{x}^{3}+{x}^{4}+{x}^{5}$

Web reference

MathML specification