Question

f: R->R, f(x)= -3x+2
Comparati: f(radical din 2-1) si f(radical din 2)

Answer 1

$f(x)=-3x+2$
$f( \sqrt{2}-1 ) = -3 \sqrt{2} -1$
$f( \sqrt{2} )= -3 \sqrt{2}$
$-3 \sqrt{3} -1.... -3 \sqrt{2}$
$-\sqrt{27} -1....-\sqrt{18}$
$-\sqrt{27} - 1 > -\sqrt{18}$