Question

x²-4 x +4=0 qual a resposta?

Answer 1

$x^{2} -4 x +4=0 \\ \\ \Delta = (-4)^2 - 4.1.4 \\ \Delta = 0 \to \ ra\' i zes \ iguais$

$x = \frac{-(-4) \pm \sqrt{0} }{2.1} = \frac{4 \pm 0}{2} \\ \\ \boxed{x' = x'' = \frac{4}{2}= 2}$

Answer 2

 
 
 
x²-4 x +4=0 qual a resposta?

Δ = (-4)² - ²4.1.4 = 16 - 16 = 0

x= 4+/- √0 ==> 4+/-0
       2.1               2

x1=x2 = 4+/-0
                2

 x1=x2 = 2