Question

determine as raízes x2-x-1=0

Answer 1

x² - x - 1 = 0
Δ = b² - 4 . a .c
Δ = -1² - 4 . 1 . -1
Δ = 1 + 4
Δ = 5 
\/¨5
x = -b +ou -\/¨5/2.1
x´= - (-1 ) +\/¨5/2
x´=1 + \/¨¨5/2
x" = 1 - \/¨¨5/2