Do you mean (3ax-15a)+(x-5)?
If so, then this is simply a matter of factoring by grouping, which you should have learned in pre-algebra.
You should show these steps in your work:
1. (3ax-15a)+(x-5)- beginning equation
2. 3a(x-5)+1(x-5)- factoring it out
3. (3a+1)(x-5)- rule of factoring by grouping
You should learn this method, because it is very simple and helps you a lot in factoring chapters.
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False
3x
(x + 8)(x - 5)
x2 + 12x + 32 = (x + 8)(x + 4)
(5x - 1)(x + 6)