Question

Am nevoie de punctul c. Cine ma poate ajuta? ​

Answer 1

$\displaystyle\left(x^2+\frac1{x^2}\right)^2=x^4+2\cdot x^2\cdot\frac1{x^2}+\frac1{x^4}=x^4+\frac1{x^4}+2=6+2=8\\\\x^2+\frac1{x^2}=\sqrt8=2\sqrt2$