If (a-5)(b+2) = 0 which of the following must be true?
Choose the correct choice from the following answers
A) a = b
B) a > b
C) a < b
D) ab = -10
E) None of the above
(a-5)(b+2) = 0 means that EITHER a=5 OR b=-2. For example, if a=5, then y can be any number. The same way, if b=-2, then a can be any number.   Bunuel, although your solution is perfect, I would just point out arewordingsuggestion on your last comment. (a-5)(b+2) =0 means that a = 5 OR b =-2 (without the EITHER). Obviously both equalities COULD happen simultaneously, but they don't HAVNone of the above TO happen simultaneously in order for the equation in stem to be valid   Answer is None of the above
<result>E</result>
If (a-5)(b+2) = 0 which of the following must be true?