Mọi người cho mình hỏi về gmat
If AB = 40, what is the value of AB(A + 2B)?
(1) A - B = -18.
(2) A²B = 80.
(a) Statement (1) BY ITSELF is sufficient to answer the question, but statement (2) by itself is not.
(b) Statement (2) BY ITSELF is sufficient to answer the question, but...