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# What math property is ab equals ba?

Updated: 10/25/2022

Wiki User

13y ago

A*B=B*A is an example of the commutative property of multiplication.

Wiki User

13y ago

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Q: What math property is ab equals ba?
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no; commutative

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NB, Nb

A = 1, B = 9

### If a and b are positive numbers such that ab equals ba and b equals 9a then find the value of a?

With the information given in the question, we can't find the value of either 'a' or 'b' yet, because there's really only one equation given so far. The statement "ab = ba" is an "identity", not an equation. It's simply a statement of the commutative property of multiplication, and it's true for all values of 'a' and/or 'b'. There's no information in it.