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Stiind ca x-1 supra x=3 calculati x patrat+1 supra x patrat.Cum se numesc astea?Ajutoor,va rog.La ce lectie le gasesc?

Răspuns :

x- 1/x=3

x^2 +1/x^2=(x- 1/x)^2 +2=9+2=11

x^2 +1/x^2 =11

Sau:

Ridicam la patrat x- 1/x=3:

(x- 1/x)^2=9

x^2 -2+1/x^2 =9

x^2 +1/x^2 =11