Question

Tìm x 

x^2 - x = -1/4

 

Answer 1

` x^2 - x = -1/4 `

` => x^2 - x - ( -1/4) = 0 `

` => x^2 - x + 1/4 = 0 `

` ( x - 1/2)^2 = 0 `

` => x - 1/2 = 0 `

` => x = 1/2 `

Vậy ` x = 1/2 `

Answer 2

x² - x = -1/4

x( x - 1 ) = -1/4

Chia thành 2 trường hợp :

TH1 : x = -1/4

TH2 : x - 1 = -1/4 

x = (-1/4) + 1

x = 3/4

Vậy x ∈ { -1/4; 3/4}