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January 28, 2015

January 28, 2015

Posted by **Iz** on Sunday, April 25, 2010 at 7:07pm.

Please help me solve, I am desperate!

- Math -
**Mike**, Sunday, April 25, 2010 at 7:59pmWhen simplifying rational expressions you need to factor all the numerators & denominators (if possible):

x^2-x-12 --> (x-4)(x+3)

x^2-3x-4 --> (x-4)(x+1)

x^2-1 -----> (x+1)(x-1)

x^2+2x-3 --> (x+3)(x-1)

Therefore you will have:

(x-4)(x+3)*(x+1)(x-1)

(x-4)(x+1) (x+3)(x-1)

You can then cancel out all common factors that appear on top and bottom. If you notice, for every factor on top, there is a match on the bottom. THus, everything cancels out leaving you with a final answer of 1!

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