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21 July, 14:29

The square of the sum of two consecutive natural numbers is greater than the sum of the squares of these two numbers by 112. find the two numbers.

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  1. 21 July, 17:18
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    We solve the equation, (a + a + 1) ^2 = 112 + a^2 + (a + 1) ^2;

    Then, (2a + 1) ^2 = 112 + a^2 + a^2 + 2a + 1;

    4a^2 + 4a + 1 = 113 + 2a^2 + 2a;

    Finally, 2a^2 + 2a - 112 = 0;

    a^2 + a - 56 = 0;

    We use Quadratic Formula for this Quadratic Equation;

    The solutions are a1 = 7 and a2 = - 8;

    But a is a natural number; so, a = 7;

    The natural consecutive numbers are 7 and 8.
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