For all real numbers a and b, where a · b ≠ 0, let , which of ... ...

For all real numbers a and b, where a · b ≠ 0, let Image, which of the following must be true?

 


(A) ab=ba
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Math - Problem Set U: Algebraic Expressions

 
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For all real numbers a and b, where a · b ≠ 0, let , which of ... ... 
Posted: 01/25/2015 13:16
Is The explanation for (c) correct? The equation on both sides of the equal sign are equal. Am I reading this incorrectly?