Question

(×-2)²-×=1 qual er a resposta dessa conta

Answer 1

(x-2)^2 - x = 1
x^2 -2.2x+2^2 - x = 1
x^2 - 4x + 4 - x = 1
x^2 - 5x + 4 - 1= 0
x^2 - 5x + 3 = 0
a= 1; b = - 5; c = 3
∆ = b^2 - 4ac
∆ = (-5)^2 - 4.1.3
∆ = 25 - 12
∆ = 13

x= [-b +/- √∆]/2a
x= [- (-5) +/- √13]/2.1

x' = [5+√13]/2
x" = [5-√13]/2