Question

Ajutor,va rog!Calculati $x^{2} + \frac{1}{ x^{2} }$,stiind ca $x- \frac{1}{x} =3$

Answer 1

(x-1/x)la2=9
xla2-2*x*1/x+1/xla2=9
xla2-2+1/xla2=9
xla2+1/xla2=9+2
xla2+1/xla2=11

* este inmultire