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26-06-2020
Mathematics

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simplify (√5+4)(√5-2) A)-3+2√5 B)3+2√5 C)-2+3√5

Respuesta :

26-06-2020

Answer:

A

Step-by-step explanation:

[tex](x + y)(a - b) = xa - xb + ya - yb[/tex]

(√5+4)(√5-2) =

= [tex]( {\sqrt{5})}^{2} - 2 \sqrt{5} + 4 \sqrt{5} - 8[/tex]

= [tex]5+ 2 \sqrt{5} - 8[/tex]

= [tex] - 3+ 2 \sqrt{5} [/tex]

Hope this helps ^-^

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