( \sqrt{5} - 1)( \sqrt{5 } + 1)

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( \sqrt{5}  - 1)( \sqrt{5 }  + 1)

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Hadley 7 days 2021-09-11T11:55:49+00:00 1 Answer 0 views 0

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    2021-09-11T11:57:36+00:00

    Answer:

    4

    Step-by-step explanation:

     (\sqrt{5 }  - 1)( \sqrt{5}  + 1) \\ it \: is \: in \: the \: form \: of \: (a + b)(a - b) \\ so \\   { \sqrt{5} }^{2}  -  {1}^{2}   \\ = 5 - 1 = \\  4

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