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Find the square of 509 using (a + b)^2 = a^2 + 2ab + b^2

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Find the square of 509 using (a + b)2 = a2 + 2ab + b2

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5092 = (500 + 9)2 = 5002 + 2 x 500 x 9 + 92

= 250000 + 9000 + 81

5092 = 259081

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