You are given the following expression a(a+b). The only thing you know is that “a” is a negative number and that “b” is also a negative number. Chris, a 7th grader student is convinced that when you evaluate the expression, the final answer will always be a positive number. Is Chris correct? How do you know?

d is the only accurate one

step-by-step explanation:

answer: the proof is mentioned below.

step-by-step explanation:

since, given:   lines bc = ef

prove:   lines ac > ef

          statements                                           reason

1. bc=ef                                           1. given

2. ac= ab+bc                                 2. because b is the point between the  

                                                            line segment ac

3.   ac > bc                                       3. because if a line segment is equal to

                                                          the sum of two line segments then it is

                                                          always greater then each of these

                                                          individual line segments

4. ac > ef                                         4. by equality property.