I am having hard time to understand why a-b = -(b-a)


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10 months ago by

I just memorize it but I don't quite understand why.

add commentfollow this post modified 10 months ago by Andrew Reid   • written 10 months ago by Bryan White  

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10 months ago by

 Using the the distributive property,

$-\left(b-a\right)=-1\times\left(b-a\right)=-b+a=a-b$(ba)=1×(ba)=b+a=ab 

add comment written 10 months ago by Andrew Reid  
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10 months ago by

Intuitively speaking, a-b is the difference between a and b. Whereas b-a is the difference between b and a. They are just opposite of each other and therefore the minus sign.

add comment written 10 months ago by Michelle Nelson  
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