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Let 'N' be the number. The sum of the number and 13 is (N+13).

The square of the sum of the number and 13 is (N+13)2

N2 + 26 N + 169.

It's probably easier to add 13 to the number and then square that answer ... less arithmetic.

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15y ago

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Q: The square of the sum of a number and 13?
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