mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle mathsize="12px"><mrow><mi mathvariant="normal">y</mi><mo>=</mo><mi mathvariant="normal"></mi><msqrt><mn>324</mn></msqrt><mo>=</mo><msqrt><mn>81</mn></msqrt></mrow></mstyle></math>