Subtract the square of 21 from the square of 22 without actually calculating the squares.
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Answered by
1
Answer:
Given,
We need to Subtract the square of 21 from the square of 22 without actually calculating the squares.
Using the formula
We get.....
Answered by
1
Answer:
we can write 21 as 20+1
if square
we can write 22 as 20+2
if square
by using identity
=43 is the correct answer
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