Question 570890
<pre>
If it were 

<font color="green">j</font><font color="red">A</font><font color="green">-10</font><font color="red">A</font>

then you would factor out the red <font color="red">A</font>, and it would
leave the green <font color="green">j</font> and the green <font color="green">-10</font>
to go in black parentheses like this:

<font color="red">A</font>(<font color="green">j-10</font>) 

Therefore since it's

<font color="green">j</font><font color="red">(k-5)</font><font color="green">-10</font><font color="red">(k-5)</font>

then you likewise factor out the red <font color="red">(k-5)</font>, and it
leaves the green <font color="green">j</font> and the green <font color="green">-10</font> 
to go in black parentheses like this:

<font color="red">(k-5)</font>(<font color="green">j-10</font>)

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The only difference is that <font color="red">A</font> doesn't take up
as much space as <font color="red">(k-5)</font>.  One thing to learn in
algebra is how to treat big chunks of algebra the 
same way as you treat little chunks of algebra.

Edwin</pre>