<math xmlns="http://www.w3.org/1998/Math/MathML" display="block" alttext="f left-parenthesis x right-parenthesis equals a x cubed plus b x squared plus c x plus d">
  <mi>f</mi>
  <mo stretchy="false">(</mo>
  <mi>x</mi>
  <mo stretchy="false">)</mo>
  <mo>=</mo>
  <mi>a</mi>
  <msup>
    <mi>x</mi>
    <mn>3</mn>
  </msup>
  <mo>+</mo>
  <mi>b</mi>
  <msup>
    <mi>x</mi>
    <mn>2</mn>
  </msup>
  <mo>+</mo>
  <mi>c</mi>
  <mi>x</mi>
  <mo>+</mo>
  <mi>d</mi>
</math>
