Question

For all integers a, b, c, and d, which of the following is a factored from of ab + ac + db + dc

a) (a + d)(b + c)
b) (ad + db) + (ac + dc)
c) (a + c)(d + b)
d) (ab)(cd)
e) (a + b)(c + d)

Answer 1

a) is the correct answer.