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 statement (1) by itself is not.
(c) Statements (1) and (2) TAKEN TOGETHER are sufficient to answer the question, even though NEITHER statement BY ITSELF is sufficient.
(d) Either statement BY ITSELF is sufficient to answer the question.
(e) Statements (1) and (2) TAKEN TOGETHER are NOT sufficient to answer the question, requiring more data pertaining to the problem.
Vì sao đáp án ở đây là B mà không phải là C.Mình không hiểu lắm.Vì với điều kiện 2 vấn tính ra được giá trị của biệu thức mà