hi Nina1784

Welcome to the forum.

I'm trying to find a method the would help me find the base numbers

I suspect this work is leading up to quadratics and the quadratic formula **.

That formula does provide a guaranteed method for finding the two numbers but it may be easier just to look for answers like this:

Write down all the factor pairs for the product number (c = 14 in your example) and then try them to see if any add to make the sum ( b = 15)

So 14 = 14 x 1 or 7 x 2. You can quickly see that the first pair works (14 + 1 = 15)

If you get any that you cannot solve, post them here and we'll help some more.

** I'll tell you this if you want.

Bob