Factoring by Grouping (#3)
By C Gulliksen
Factor each polynomial completely.
2a2b + 2a + 5ab + 5
6x2 + 2xy + 9x + 3y
25a2 + 5ab - 5a - b
4c2d - 2c + 18cd2-9d
5m2n + 15m - 2mn - 6mn
35x2y - 21x - 5xy - 3
12x3y + 18x2 - 4x2y2 + 6xy
5st3 + 5t2 + 3st2 + 3t
8a2b - 6a - 20ab + 15
4a2 + 2ab + 14a + 7b