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24-03-2017
Mathematics

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When the sum of a number plus 3 is squared, it is 13 more than the sum of the number plus 2 when squared?

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Аноним Аноним

24-03-2017

(x + 3)² = 13 + (x + 2)²
x² + 6x + 9 = 13 + x² + 4x + 4
2x + 5 = 13
x = 4

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