Is the semantic tags example correct in https://www.w3.org/Math/whatIsMathML.html?

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I'm a newbie in MathML, so sorry if my question seems stupid.

I started to read MathML intro and I bumped into this page:
https://www.w3.org/Math/whatIsMathML.html

At the end of this page, there's an example for the math expression
x=C2=B2 + 4x + 4 =3D 0

But when I read the semantic tags example, I only get
x=C2=B2 + 4x + 4
and the "=3D 0" seems missing for me.

Could someone tell me if the example is correct or not?

Thanks in advance

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<div dir=3D"ltr"><div>I&#39;m a newbie in MathML, so sorry if my question s=
eems stupid.<br><br></div>I started to read MathML intro and I bumped into =
this page:<br><div><div><a href=3D"https://www.w3.org/Math/whatIsMathML.htm=
l">https://www.w3.org/Math/whatIsMathML.html</a><br><br></div><div>At the e=
nd of this page, there&#39;s an example for the math expression<br></div><d=
iv>x=C2=B2 + 4x + 4 =3D 0<br><br></div><div>But when I read the semantic ta=
gs example, I only get<br></div><div>x=C2=B2 + 4x + 4<br></div><div>and the=
 &quot;=3D 0&quot; seems missing for me.<br><br></div><div>Could someone te=
ll me if the example is correct or not?<br><br></div><div>Thanks in advance=
<br></div></div></div>

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