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21-09-2020
Mathematics

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(197)^2-(97)^2 evaluate without using calculator

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LammettHash LammettHash

21-09-2020

Recall the difference of squares identity:

a² - b² = (a - b) (a + b)

So

197² - 97² = (197 + 97) (197 - 97) = 284 * 100 = 28,400

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