1.

The area of a square is \[4{{a}^{2}}-12ab+9{{b}^{2}}\]square units. Which of the given expressions represents a side of the square?

A. (4a + 9b) units   
B.            (4a - 9b) units
C.        (2a + 3b) units    
D.            (2a - 3b) units          
Answer» E.


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