Question

ajuda pfv !

equaçao

x(x-2)=2(x+6)

Answer 1

x(x-2)=2(x+6)
x^2 - 2x = 2x + 12
x^2 - 2x - 2x + 12
x^2 - 4x - 12 = 0

Δ = b^2 - 4ac
Δ = 16 + 48
Δ = 54

x = (-b +ou- raiz de Δ)/2a
x = (4 +ou- raiz de 64)/2.1

x1 = (4 + 8)/2 
x1 = 12/2 = 6

x2= (4 - 8)/ 2 = -2