Question 809384
<pre>

|a+bi| = &#8730;<span style="text-decoration: overline">a²+b²</span>

|1-8i| = &#8730;<span style="text-decoration: overline">(1)²+(-8)²</span> = &#8730;<span style="text-decoration: overline">1+64</span> = &#8730;<span style="text-decoration: overline">65</span>

Edwin</pre>