Question

x²+1\x²=?
daca x+1\x=3

Multumesc

Answer 1

(x+1/x=3) | ^2
${x}^{2} + \frac{2x}{x} + \frac{1}{ {x}^{2} } = {3}^{2}$
${x}^{2} + \frac{1}{ {x}^{2} } = 9 - 2$
${x}^{2} + \frac{1}{{x}^{2} } = 7$