Question

{x-3y=19 xy=-8 sistema de equação do 2 grau

Answer 1

Resposta:

{x-3y=19   (i)

{ xy=-8  ==>x=-8/y  (ii)

(ii)  em (i)

-8/y-3y=19

-8-3y²=19y

3y²+19y+8=0

y'=[-19+√(361-96)]/6 =-19/6+√265/6

x=3y+19 =+>x =3*[-19/6+√265/6] +19

y''=[-19-√(361-96)]/6 =-19/6-√265/6

x=3y+19 =+>x =3*[-19/6-√265/6] +19