Calculate -56 – (-40) and check the commutative property under subtraction
This will be -56+40, which is -16
Commutative Property: 40-56=-16
So, we know our work is correct!
The two numbers are -56 and -40, when using a property you don't simplify -(-40) to 40 because that changes your proof.
Based on what you're saying, one might confuse that you just proved that the commutative property works for subtraction when in fact it doesn't.
But I'm still not convinced about there being no solutions?
How about -(-40)-56
I'm not saying there are no solutions... You said
"Commutative Property: 40-56=-16
So, we know our work is correct!"
You can't use the commutative property to show that your work is correct for subtraction. 40-56= -16 is correct, but that isn't the commutative property which I think is the source of our confusion.
Yeah. I say we get CPhill or someone.
I just looked at the check the commutative property under subtraction part of the question.
Let me clear this up... the commutative property is a+b=b+a this only works for addition and multiplication.
In the problem, we'll call -56, a, and -40, b. a-b= -56 - (-40)= -56+40= -16; b-a= -40 - (-56)= -40 + 56= 16. This shows that a-b does not equal b-a.
That's very true.
I wonder why the question said check it under subtraction...
Yeah! No problem...sorry if it seemed like I was being rude or anything...