Question

Simplyfy (√6 + √7)(√6 - √7)
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Answer 1

Answer:

$( \sqrt{6 } + \sqrt{7})( \sqrt{6} - \sqrt{7}) \\ =( { \sqrt{6} })^{2} - (\sqrt{7} )^{2} \\ = 6 - 7 \\ = - 1$

Answer 2

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