Question

Se stie ca a+1supra a=4.Aflati a la2 +1 supra a la 2

Answer 1

$a+\frac{1}{a}=4$ .Ridicam la patrat, si obtinem: $a^{2}+2*a* \frac{1}{a}+ \frac{1}{ a^{2} }=16 <=> a^{2}+ \frac{1}{a^{2}}+2=16 => a^{2}+ \frac{1}{ a^{2} } =14.$

Answer 2

x:x+1:x=4
$\frac{1+1}{x}$=4
$\frac{1}{3}$=x