To create simple polynomial expression, we can use the msup element to create exponents.
<!doctype html>
<html>
<head>
<title>XoaX.net's MathML: A Simple Polynomial Expression Example</title>
</head>
<body>
<p>
This is a simple polynomial expression
<math display='block'>
<mrow>
<msup>
<mi>x</mi>
<mn>2</mn>
</msup>
<mo>+</mo>
<mn>2</mn>
<mi>x</mi>
<mi>y</mi>
<mo>+</mo>
<msup>
<mi>y</mi>
<mn>2</mn>
</msup>
</mrow>
</math>
</p>
</body>
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