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Using a^2 – b^2 = (a + b) (a – b), find 12.1^2– 7.9^2

Using a^2 – b^2 = (a + b) (a – b), find
12.1^2– 7.9^2

Grade:12

1 Answers

Harshit Singh
askIITians Faculty 5964 Points
8 months ago
Dear Student

12.1^2–7.9^2
= (12.1 + 7.9)(12.1 - 7.9)
= 20 x 4.2
= 84

Thanks

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