Question

50 баллов, все на фото ​

Answer 1

$f(x)=\frac{6-x^2}{x-1}\\\\\\f(\sqrt5+1)=\frac{6-(\sqrt5+1)^2}{(\sqrt5+1)-1}=\frac{6-(6+2\sqrt5)}{\sqrt5}=\frac{-2\sqrt5}{\sqrt5}=-2$