Use the delimiters \( and \) for in-line equations, and \[ and \] for displayed equations. See http://docs.mathjax.org/en/latest/input/tex/delimiters.html ↗.
Quiz
What's wrong with: \dfrac{8x^{24}}{x^{20}}=8x^{4}
ການສົນທະນາຖືກລັອກ ດັ່ງນັ້ນ ທ່ານບໍ່ມາສາດຕອບກັບມັນ.