DECEMBER 2ND 2010

Hey guys its ruby and i'm going to summarize what we learned in class on Thursday December 2nd.
Firstly we started by finishing example D from our assignment the previous day. We quickly started getting into what we were learning next which was Solving Rational Equations.

Here are the steps on how to solve rational equations.
1.Find the NPV(S) (non-permissible value(s)) of the denominator by factoring
2.Write the equation without the denominators by multiplying each term by the LCM (lowest common multiple) of all the denominators, also known as the LCD (lowest common denominator)
3.Solve as usual
4.Check that  your final solution is not one of the non-permissible values.

Another way you can solve rational equations is by cross multiplying if possible.
Here is an example:

As you can see in this example i used cross multiplication because it was possible.
The NPV of this equation would be 5 because when you plug in 5 for X in the denominator, it equals to 0 therefore, it is your NPV.
In step one you can see that i cross multiplied and ended up ith what we have in step two. In step two, i multiplied out the brackets. I then solved and ended up with 4 and 1 as my answers.

For homework everyone was given an algebra review to study over the weekend. There will be a test tomorrow so good luck to everyone!