Question

Daca x+1supra x=7 atunci valoarea expresiei x la a doua +1 supra x la a doua.este egala cu.....

Answer 1

[tex]x+\frac{1}{x}=7|()^2\\ (x+\frac{1}{x})^2=49\\ x^2+2*x*\frac{1}{x}+\frac{1}{x^2}=49\\ x^2+\frac{1}{x^2}+2=49\\ x^2+\frac{1}{x^2}=47[/tex]