Question

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

Answer:

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

Answer 2

Step-by-step explanation:

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

$(a - b)(a + b) = {a}^{2} - {b}^{2}$

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

$= 4 - 5$

$= - 1$

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