Question

simplify
$\sqrt{11} - \sqrt{7} )( \sqrt{11} + \sqrt{7} )$
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Answer 1

Step-by-step explanation:

$( \sqrt{11} \times - \sqrt{7} )( \sqrt{11} + \sqrt{7} ) = { \sqrt{11} }^{2} - { \sqrt{7} }^{2} = 11 - 7 = 4$