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      <text>10.1.2.1 Addition and subtraction of complex numbers</text>
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      <text><![CDATA[<h3>Addition and subtraction of complex numbers</h3>
<p>Let <span class="math inline">\(z\)</span> and <span class="math inline">\(w\)</span> be any two complex numbers <span class="math inline"> where \(z=a+i b\) and \(w=c+i d\)</span> then 
<span class="math inline">\[z+w=(a+c)+i(b+d),\] \[z-w=(a-c)+i(b-d).\]</span> For example if <span class="math inline">\(z=2-3i\)</span>, <span class="math inline">\(w=-4+2i\)</span> then <span class="math inline">
\[z+w=\{2+(-4)\}+\{(-3)+2\}i =-2-i,\]
\[z-w=\{2-(-4)\}+\{(-3)-2\}i =6-5i\]</span></p>]]></text>
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