Hi,

I was presented with the following question (question 4).

help4.jpg
I was able to complete it using the below method.... Notice how in the bottom line, in the second lot of bracket, the z term has a coefficient of 2.

HELP.png
I was then presented with the following similar question (question 7).

help3.jpg
I was able to begin factorizing it using the below method. Notice how there is no coefficient of x in the second lot of brackets like last time. Now it is out the front of the entire

equation.

HELP2.png
I understand the process of equating coefficents after this point to find the values of the unknowns. What I don't understand is in the first example why the coefficient of x can come into the second lot of brackets, while in the second example, the coefficient of x (2) has to stay out the front. When I attempted to use the alternate method in either example, it completely ruins it and gives a wrong answer. Can anyone please provide some explanation as to how/why/when you use either method or what I'm missing/forgetting/doing wrong?

Thanks

## Bookmarks