Question

if a=(-21) and b=(-7, show that (a-b) not equal to (b-a)

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Answer 1

(a-b) is equal to negative (b-a).

If you want them to be equal, it should be 0 so that the sign doesn't effect.

But a-b=-14 not equal to 0.

So (a-b) doesn't equal (b-a).