ab165
ab165 ab165
  • 01-05-2020
  • Mathematics
contestada

can someone help answer these questions thank you !

can someone help answer these questions thank you class=

Respuesta :

devishri1977
devishri1977 devishri1977
  • 01-05-2020

Answer:

Step-by-step explanation:

4) (a - b)² = a² - 2ab + b²

[tex](5-\sqrt{5})^{2}=5^{2}-2*5*\sqrt{5}+(\sqrt{5})^{2}\\\\ =25-10\sqrt{5}+5\\\\=30-10\sqrt{5}[/tex]

5) Use FOIL method.

[tex](1+\sqrt{2})(3-\sqrt{2})=(1*3)+1*(-\sqrt{2})+\sqrt{2}*3+\sqrt{2}*(-\sqrt{2})\\\\ =3-\sqrt{2}+3\sqrt{2}-2\\\\=3-2-\sqrt{2}+3\sqrt{2}\\\\=1-2\sqrt{2}\\[/tex]

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