find the smallest number which must be subtracted from 1989 to make it a perfect square
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We have,
1989 be make perfect square.
We know that,
44
2
=1936<1989
45
2
=2025>1989
Let x be added or subtracted in 1989
Then,
x+44
2
=1989
⇒x+1936=1989
⇒x=1989−1936
⇒x=53
53 is subtracted from 1989 making perfect square.
Hence, this is the answer.
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