# Thread: fraction - where am i going wrong?

1. ## fraction - where am i going wrong?

hi, this is my question:

for this i then used the box method on X+1 and x+2 to get the denominator and timesed 4 by x+1 and 3 by X+2 to get this:

i then simplified it to get this:

i then times the bottom of the fraction by 2 which =

i then work it out to get this:

[IMG]file:///C:/DOCUME%7E1/Andrew%21/LOCALS%7E1/Temp/moz-screenshot.png[/IMG][IMG]file:///C:/DOCUME%7E1/Andrew%21/LOCALS%7E1/Temp/moz-screenshot-1.png[/IMG]

2. from this i get a quadratic equation which looks like this:

then i get this for the next part but when i worked it out i got -7 in the square root and that wouldn't work! where am i going wrong?

3. You appear to have a sign error between the question and step 2.

Question: $\dfrac{3}{x+1} - \dfrac{4}{x+2} = 2$

You've mixed some signs up because what you should get is $\dfrac{3(x+2) - 4(x+1)}{(x+1)(x+2)}$. When simplified it becomes
$\dfrac{3x+6-4x-4}{x^2+3x+2} = \dfrac{-x+2}{x^2+3x+2} = 2$

4. hi, after the changes would the quadratic equation then look like this: