# Thread: What am I missing here?

1. ## What am I missing here?

Hi all, this is really bothering me... I am just not seeing how ...

(x-a)+(x-a)(x+a) ----> (x-a)(x+a+a)

..... I know this is true because I have looked it up in a solution manual and my professor did this on the board. How!!!? Any help would be greatly apprieciated!

2. Originally Posted by ahroogahh
Hi all, this is really bothering me... I am just not seeing how ...

(x-a)+(x-a)(x+a) ----> (x-a)(x+a+a)

..... I know this is true because I have looked it up in a solution manual and my professor did this on the board. How!!!? Any help would be greatly apprieciated!

I think you want to say,
(x-a)(x+a+1)

Because you have,
(x-a)(1)+(x-a)(x+a)

Notice you have a common factor, (x-a), thus,

(x-a)(1+x+a)

3. Originally Posted by ahroogahh
Hi all, this is really bothering me... I am just not seeing how ...

(x-a)+(x-a)(x+a) ----> (x-a)(x+a+a)

..... I know this is true because I have looked it up in a solution manual and my professor did this on the board. How!!!? Any help would be greatly apprieciated!