Find (40² - 39²) + (38² - 37²) + (36² - 35²) + .... +(2² - 1²)
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Answered by
3
Answer:
Step-by-step explanation:
Let us see the first expression...
(40^2-39^2)=(40+39)(40-39)[using a^2-b^2 formula]
Therefore the answer of first expression is 40+39.
So,the answer of the above question will be----
1+2+3+4.....+39+40
So the answer is (40×41)÷2
=820
Hope it helps
Answered by
0
So the answer is (40×41)÷2
=820
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