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

User Jko
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1 Answer

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Recall the difference of squares identity:

a² - b² = (a - b) (a + b)

So

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

User Ajberry
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