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Substitution

Determine the...

Question

Determine the value of 4(x + y). If x and y are two alternate natural numbers such that $x^{2}$ - $y^{2}$ = 24.

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Solution

The difference between alternate square numbers is always even; it is twice the sum of the two numbers that are squared.
2(x+y) = 24
4(x+y) = 48

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