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in Number System by (15 points)
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\( (\sqrt{7}+\sqrt{5})(\sqrt{7}-\sqrt{5}) \)

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1 Answer

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by (45.4k points)

As we know that,

(a + b) (a - b) = a2 - b2

\((\sqrt7 + \sqrt5) (\sqrt7 - \sqrt5)\) 

\((\sqrt7)^2 - (\sqrt5)^2\) 

 = 7 - 5

= 2

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