Question

Buna ! Ex 2 va rog!

Answer 1

a+1/a=5/2 si ridici la patrat: $(a+ \frac{1}{a} )^2=a^2+2a*\frac{1}{a} +( \frac{1}{ya})^2 = \frac{25}{4}$ , deci $a^2+2+ (\frac{1}{a})^2 = \frac{25}{4}$, adica $a^2+ \frac{1}{a}^2 = \frac{17}{4}$