Factor by grouping.

Question

36 + ab + 2b + 18a

A. (a-2)(b-18)

B. (a+2)(b+18)

C. (a+2)(18a+2)

D. (ab+2b)(36+18a)

E. this cannot be factored.

Answer 1

b(a+2)+18(2+a)

=(b+18)(a+2)

so B