[tex]\left(\frac{2}{-5-B} +\frac{2}{-5-B} \right) : \frac{8(-5)^2}{(-5)^2-B^2}[/tex]
[tex]\left(\frac{2}{-5-B} +\frac{2}{-5-B} \right) : \frac{8 \times 25}{25-B^2}[/tex]
[tex]\left(\frac{2}{-5-B} +\frac{2}{-5-B} \right) : \frac{200}{25-B^2}[/tex]
[tex]\left(\frac{2}{-5-B} +\frac{2}{-5-B} \right) : \frac{200}{25-(-5)^2}[/tex]
[tex]\left(\frac{2}{-5-B} +\frac{2}{-5-B} \right) : \frac{200}{25-25}[/tex]
[tex]\left(\frac{2}{-5-B} +\frac{2}{-5-B} \right) : 0[/tex]
Since the denominator becomes 0, the expression is undefined when a = -5.
[tex]\left(\frac{2}{-5-B} +\frac{2}{-5-B} \right) : \frac{8(-5)^2}{(-5)^2-B^2}[/tex]
[tex]\left(\frac{2}{-5-B} +\frac{2}{-5-B} \right) : \frac{8 \times 25}{25-B^2}[/tex]
[tex]\left(\frac{2}{-5-B} +\frac{2}{-5-B} \right) : \frac{200}{25-B^2}[/tex]
[tex]\left(\frac{2}{-5-B} +\frac{2}{-5-B} \right) : \frac{200}{25-(-5)^2}[/tex]
[tex]\left(\frac{2}{-5-B} +\frac{2}{-5-B} \right) : \frac{200}{25-25}[/tex]
[tex]\left(\frac{2}{-5-B} +\frac{2}{-5-B} \right) : 0[/tex]
Since the denominator becomes 0, the expression is undefined when a = -5.