ok ... solve for x in each case to determine critical values.
Now what? ... btw, pay attention to the domain of the original function.
Remember! Division by zero is not defined.
skeeter got the roots excluding and by separating the contents using the formula for the difference of two squares,
that is , just as he had written, because .
Now, considering that division by zero isn't defined, what has to be zero for the fraction to equal zero?