Question

Como resolver x elevado a 2 -2x-3=0

Answer 1

x² - 2x -3 = 0
delta = 4 + 12
delta = 16 
X¹ = 2 + 4/2 = 6/2 = 3
X² = 2 -4/2 = -2/2 = -1

Answer 2

x^2 - 2x - 3 = 0             Δ = b^2 - 4 ac    Δ = 4 - 4 .1 . (-3)    Δ = 16

a= 1   b= -2   c = -3

x= -b +- √Δ / 2a

x' = 2 + 4 / 2       x' = 3

x'' = 2 - 4 / 2       x'' = -1