Question

What is the difference between the two marked below??? Explain .Dont spam

Answer 1

Explanation:

I think

when (A±∆A)-(B ±∆B) is expanded

then you can see ± will remain same for ∆A

but for ±∆B it becomes. -(±B)

now as plus is above and minus is below but after multiplying with minus sign obviously plus becomes negative and negative becomes plus, thus sign interchange itself

hope this helps you !