Respuestas

  • Usuario de Brainly
2013-04-06T00:13:51+02:00

x + 1/x = 9

x² + 1 = 9x

x² + 1 - 9x = 0 

x² - 9x + 1 = 0

x1= 8.88......x2= 0,11

 

entonces

x² + x-² =........................x1=8.88

(8.88)² + ( 8.88)-² =

(8.88)² + (1/8.88)² =

78.85 + 0.012 = 78.862

 

x² + x-² =........................x1=0.11

(011)² + ( 0.11)-² =

(0.11)² + (1/0.11)² =

0.0121 + 82.64 = 82.65

 

 

espero que te sirva, salu2!!!