Question

Va rog sa ma ajutati la ex 4.

Answer 1

$(x+ \frac{1}{x})^2=4^2 \\ x^2+2*x* \frac{1}{x}+ \frac{1}{ x^{2} }=16 \\ x^{2} + \frac{1}{ x^{2} }=16-2 \\ x^{2} + \frac{1}{ x^{2} }=14$