The following expressions are the areas of rectangles. Find the possible lengths and breadths of these rectangles.
1. \(x^2+9x+20\)
2. The area of a rectangle is \(x^2+7x+12\). If its breadth is \((x+3)\), then find its length
Answer variants:
\((x-4)\)
\((x+5)(x-4)\)
\((x+4)\)
\((x+5)(x+4)\)