Question

(2+√5)(2-√5) simply expression​

Answer 1

$(2 + \sqrt{5} )(2 - \sqrt{5})$

$2(2 - \sqrt{5} ) + \sqrt{5}(2 - \sqrt{5} )$

$2 - 4 \sqrt{5} + 2 \sqrt{5} - ( \sqrt{5}) ^{2}$

$2 - 2 \sqrt{5} - 5$

$- 3 - 2 \sqrt{5}$

Answer 2

Answer:

-1

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Step-by-step explanation:

$(2 + \sqrt{5} ) (2 - \sqrt{5} ) \\ (( {2})^{2} - ({ \sqrt{5} }^{2} )) \\ (4 - 5) \\ - 1$