Réponses

  • Omnes
  • Modérateur confirmé
2014-02-28T22:37:18+01:00
Salut,

f(x) = x² + 5/11
f(5√2) = (5√2)² + 5/11 = 25*2 + 5/11 = 50 + 5/11 = 555/11

k(x) = x² - 6
k(x) = 6
x² - 6 = 6
x² - 6 - 6 = 0
x² - 12 = 0
(x+√12)(x-√12) = 0

x + √12 = 0
x = -√12

x-√12 = 0
x = √12

S={-√12; √12}

Bonne soirée !