Quote:

Originally Posted by

**recca** Is there an associative property of subtraction? In other words, is

A- (B-C)=(A-B)-C

true for all real numbers A, B, C? Explain your answer. If the equation is always true, explain why; if the equation is not always true, find another expression that is equal to the expression

A- (B-C)

and explain why the two expressions are equal.

I don't think that's possible....not for all real numbers. There is a A+(B+C)=(A+B)+C.....but you are talking about subtraction....

example:

A=4

B=5

C=6

A-(B-C)=(A-B)-C

4-(5-6)=(4-5)-6

4-(-1)=(-1)-6

5=-7

doesn't work obviously.