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we have b-a

take - sign common,we get


hence proved

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Q: How can you prove that b - a is the negative of a - b?
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How does an only child prove there are no other siblings?

Prove to whom? You can't "prove" a negative.

How can you prove that God is true?

you can't, but you can't prove a negative either.

How do we know vampires aren't real?

We don't. It is impossible to prove a negative. It is called the Paradox of negative information. You can only prove something does exist, you cannot prove non-existence.

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If the mother is A negative, and the father is B positive, they could have children who are A negative, A positive, B negative, B positive, AB negative, AB positive, O negative, or O positive.

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Negative B was created in 2001.

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Since you cannot prove a negative statement, one cannot prove that ghosts do not exist.

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