Question

x+1/x=3

${x}^{2} + \frac{1}{ {x}^{2} } =$
Heeeelppp

Answer 1

daca (x+1/x)=3 atunci (x+1/x)²=9⇔x²+2·x·1/x+1/x²=9⇔x²+1/x²=9-2⇒x²+1/x²=7