Look at the image attached: It shows the differentiation of a rational function using
I am having difficulties understanding why the final calculation of the derivative is equal to:
*Note: The final solution is not shown on the image attached.
The entire thing can be viewed here:
Looking at the steps in the image attached, I understand everything that's happening up until the final line.
From my interpretation it seems it should be:
Where is the -7 coming from? What steps am I missing and what am I doing wrong?