Question

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$( - 3 + \sqrt{5)} ( - 3 - 5)$
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Answer 1

Answer:

$= ( - 3 + \sqrt{5} )( - 3 - 5) = ( - 3)( - 3) + ( - 3)( - 5) + ( - 3)( \sqrt{5} ) + ( - 5)( \sqrt{5} )= 9 + 15 - 3 \sqrt{5} - 5 \sqrt{5} = 24 + 8 \sqrt{5} = 8(3 - \sqrt{5} )$