Which expression is the multiplicative identity of -3(a ? b)? A.0 B. 1 C. 3(a ? b) D. -3a + 3b
The product of a number and its multiplicative identity just returns the original number. So the multiplicative identity of any number is 1. We can justify this by saying that any number (except zero) divided by itself is 1: a/a 1 and therefore a 1*a. The additive inverse is the number that when added to the original number gives zero. In other words, it would be the negative of the original number. The additive inverse for -3(a-b) is -(-3(a-b)) 3(a-b).
