x-1/x=9 9/10 .................

Question

x-1/x=9 9/10 .................

Comments

че здесь искать ?

Answer 1

x-1/x=9 
x^2 - 1 = 9x
x^2 - 9x -1 =0
D = 81 - 4*1*(-1) = 85
x = 1/2 (9 -/+√85 )
x1 =(9 -√85 ) /2
x2 =(9 +√85 ) /2