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Question

Find the consecutive even integers whose squares have the sum 340.

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Solution

Let the integer be 2x,
It is given that,
left parenthesis 2 x right parenthesis squared plus left parenthesis 2 x plus 2 right parenthesis squared equals 340 4 x squared plus 4 x squared plus 4 plus 8 x equals 340 8 x squared plus 8 x minus 336 equals 0 x squared plus x minus 42 equals 0 x squared plus 7 x minus 6 x minus 42 equals 0 x left parenthesis x plus 7 right parenthesis minus 6 left parenthesis x plus 7 right parenthesis equals 0 left parenthesis x minus 6 right parenthesis left parenthesis x plus 7 right parenthesis equals 0 x equals 6 comma negative 7

So, the integers are 12, -14

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