Question

Consideram numarul N=$\sqrt{(a-2)}^{2} + l a-1 l - 2 l a l$,unde ∈ R.
a)Calculati N,pentru a=2
b)Calculati N,daca a>2.
c)Determinati a∈R,astfel incat l N l=3

Answer 1

A) N=0+1-2*2=1-4=-3;;b) pt a>2=>N=a-2+a-1-2a=-3. . C) deoarece pt a=2 N=-3=> pt a=2 |N|=3