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Answer : 3 or 4

Let the number be represented by n.

12 + n2 = 7n : n2 - 7n + 12 = 0

This equation can be factored.

(n - 3)(n - 4) = 0

Then either n - 3 = 0, when n = 3 ; or n - 4 = 0, when n = 4

CHECK : 12 + 32 = 12 + 9 = 21 = 7 x 3

12 + 42 = 12 + 16 = 28 = 7 x 4.

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14y ago

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