Can someone help answer these questions thank you !

asked Jan 21, 2021 29.8k views

3 votes

by Areim

5.5k points

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1 vote

Answer:

Explanation:

4) (a - b)² = a² - 2ab + b²

$(5-√(5))^(2)=5^(2)-2*5*√(5)+(√(5))^(2)\\\\ =25-10√(5)+5\\\\=30-10√(5)$

5) Use FOIL method.

$(1+√(2))(3-√(2))=(1*3)+1*(-√(2))+√(2)*3+√(2)*(-√(2))\\\\ =3-√(2)+3√(2)-2\\\\=3-2-√(2)+3√(2)\\\\=1-2√(2)\\$

Adrian Herscu answered Jan 26, 2021

5.0k points

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