Fully simplify

?

Yes or no?

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- January 4th 2010, 03:27 AMMukilabBasic fractional equation
Fully simplify

?

Yes or no? - January 4th 2010, 03:36 AMearboth
Definitely No!

1. Cancel the common factor.

2. Determine the domain of the term at the LHS.

3. Set the numerator equal to zero, solve for x.

By the way: The simplification isn't necessary here: Multiply both sides of the equation by the denominator after you've determined the domain of the complete term. - January 4th 2010, 03:37 AMmr fantastic
- January 4th 2010, 03:40 AMMukilab
Thanks for the answer earboth ^^ worked it out now

- January 4th 2010, 05:22 AMdkaksl
- January 4th 2010, 05:26 AMe^(i*pi)
The domain is which input values give real output values. Essentially this boils down to a few simple rules of which you should use the first

The denominator can never equal 0

Values inside logarithms must be greater than 0

Values inside even roots (such as square root) must be greater than 0

In your case which means any value that makes is not part of the domain - January 4th 2010, 05:50 AMdkaksl
So... it's safe to assume the following; , ; ?

then how does this work out?

Quote:

Originally Posted by**earboth**

;

does this not grant two answers for ?

Edit: O wait, I think I got it now. The domain also includes which in the end means you do have to factorise both nominator and denominator of the original equation. - January 4th 2010, 05:58 AMe^(i*pi)
I actually missed out something in my answer and that is that 3 is not in the domain either.