Non-Permissable Values & Rational Equations

• June 30th 2013, 10:15 PM
Mathnood768
Non-Permissable Values & Rational Equations
http://i.imgur.com/2Oc8kGa.jpg

my attempt: imgur: the simple image sharer

I've only tried a and b but I need help with all abcd...

These are a lot more complicated then the questions I had to do before... I don't know what the next step is after simplifying the numerator and denominator...

answers: imgur: the simple image sharer
• June 30th 2013, 10:41 PM
Prove It
Re: Non-Permissable Values & Rational Equations
Hint: You can not divide by 0...
• July 1st 2013, 01:03 PM
Mathnood768
Re: Non-Permissable Values & Rational Equations
i already knew that, i need much more help then that.
• July 1st 2013, 01:45 PM
Re: Non-Permissable Values & Rational Equations
If you find yourself unable to factor the polynomials in the numerator, then you made a mistake simplifying. Be careful with distributing signs and such. Also, always before simplifying find the non-permissable values by setting the denominator to 0, since the denominator cannot equal zero, the value you find from that equation are you non-permissable values. If you try to find these values after simplification, you will miss a few of them.
• July 1st 2013, 02:56 PM
Plato
Re: Non-Permissable Values & Rational Equations
Quote:

Originally Posted by Mathnood768
i already knew that, i need much more help then that.

I see that as just a cry for help with basic, basic simple algebra.

BTW all one has to do is consider denominators, Consider #26, d.

$(2x+1)^2-(x+2)^2=3x^2-3$ that tells you $x\ne\pm 1~.$

So review your foundation in basic algebra.
• July 1st 2013, 03:11 PM
Mathnood768
Re: Non-Permissable Values & Rational Equations
i've read through the examples that were given for this topic, they are not as complicated as these ones, i am okay at more simpler algebra and haven't looked at anything like this yet, (just got on this topic and read all the info my textbook gave me on it) it would help if someone actually gave direct help with the first question i tried to do and tell me if i've atleast simplified it correctly so far, i know that if i have, i'd have to get the non permissible values then write the equation in the simplest terms; i know this. my problem is with the algebra and what direct steps i should take because i'm not good at algebra obviously; no need rub it in, we're at different levels.

like for a) i feel like it cannot be simplified any further and that the npv is x = 3, i'm not sure how i'm suppose to end up with x+6/x+3
• July 1st 2013, 08:04 PM
Prove It
Re: Non-Permissable Values & Rational Equations
Quote:

Originally Posted by Mathnood768
i already knew that, i need much more help then that.

How ungrateful! This is more than enough information needed to be able to determine the non-permissible values.
• July 2nd 2013, 11:36 AM
Mathnood768
Re: Non-Permissable Values & Rational Equations
i know how to get the non permissible values, i need help with the algebra to get it to the final answer.

you didn't read my previous post...

like for a) i feel like it cannot be simplified any further and that the npv is x = 3, i'm not sure how i'm suppose to end up with x+6/x+3

i'm not sure why people are attacking me, i'm just saying i need more help; i'm still stuck. is that wrong? i'm not good at math, i've said this, i also said i read through the information my textbook gave me on this topic and they only show examples with really simple questions.
• July 2nd 2013, 01:38 PM