Question

Уровень В, Ершова, Голобородько,

Answer 1

$1 - (3 sqrt{7}+8)(3 sqrt{7}-8)=1-((3 sqrt{7})^2-8^2)=1-(9*7-64)= \ \ =1-(63-64)=1-(-1)=1+1=2$

Answer 2

1-(3√7-8)(3√7+8)=1-((3√7)²-8²))=1-(63-64)=1-(-1)=1+1=2