Question

what must be subtracted from x2-y+1 tp obtain x2-y
give me explaination
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Answer 1

Answer:

let number to be subtracted be ?

x2-y+1 - ? = x2-y

x2-y+1 - x2+y = ?

x2-x2 -y+y +1 = ?

1 =?

So, 1 should be subtracted.