Question 123107


Notice that, a rational equation has the {{{denominators}}} and all the 

difficulties come from them. Whichever method you use to solve a rational 

equation, at some point you're going to get rid of the denominators. 

Remember that, with rational equations, you {{{always}}}{{{ have}}}{{{ to}}}

{{{ check}}} the {{{answers }}}back in the original equation because you can 

end up with an {{{invalid}}}{{{ solution}}}. If you find an invalid solution 

(even you didn't do anything wrong), it might causes division by zero, then 

the equation really has {{{no }}}{{{solution}}}.