Question

responda as questões x2-2x+1=0

Answer 1

x² - 2x + 1 = 0 

Δ = b² - 4.a.c 
Δ = -2² - 4 . 1 . 1 
Δ = 4 - 4. 1 . 1 
Δ = 0

Há 1 raiz real.

Neste caso, x' = x'':

x = (-b +- √Δ)/2a

x' = (--2 + √0)/2.1   
x'' = (--2 - √0)/2.1

x' = 2 / 2   
x'' = 2 / 2

x' = 1   
x'' = 1

S = {1}