You want to consider where the denominator will equal zero. There are two pieces to check. (1-x) = 0 So, x = 1 5-sqrt(x^2+9)=0 Or, x= +-5 Graphing it can also help.
You want to consider where the denominator will equal zero. There are two pieces to check. (1-x) = 0 So, x = 1 5-sqrt(x^2+9)=0 Or, x= +-5 Graphing it can also help.