Question

x+y=3 e xy=-4 ajudeeee pfvr

Answer 1

x+y=3
x=3-y
substituir 1 a 2
xy=-4
(3-y)y=-4
3y-y2+4=0 (×1)
y2-3y-4=0
◆=(b2)-4ac
◆=(-3)2 -4.1.4
◆=9-8
◆=1
raiz=/
x=-(-3)+-/1÷2.1
x=3+-1/2
×'=3+1÷2=2
x"=3-1÷2=1
Valtando para 1 dai vc ja deve saber