Question 739760
<pre>
It's imaginary!  Have you studied imaginary numbers?
If you haven't, you should say this "has no REAL solutions".
But if you have studied imaginary (NON-REAL) numbers,
you should do this:

b² - 5 = -8
    b² = -3
     b = ±&#8730;<span style="text-decoration: overline">-3</span>
     b = ±i&#8730;<span style="text-decoration: overline">3</span>

Edwin</pre>