Question

X2-4×+4 saepi qual o valor numerico da expressao

Answer 1

x² - 4x + 4 = 0

a = 1

b = - 4

c = 4

∆ = b² - 4 . a . c

∆ = (-4)² - 4 . 1 . 4

∆ = 16 - 16

∆ = 0 (as raízes são reais e iguais)

x = - b ± √∆

------------

2a

x = - (-4) - 0

-----------

2 . 1

x = 4 - 0

-------

2

x = 4

---

2

x = 2

S = {2}