Respuestas

2012-08-15T14:25:19+02:00

x+y=30

xy=224

 

x=30-y

xy=224

(30-y)y=224

30y-y²=224

y²-30y+224=0

Δ=(-30)²-4*1*224

Δ=900-896

Δ=4

√Δ=2

 

x₁=(-(-30)-2)/(2*1)

x₁=28/2

x₁=14

 

x₂=(-(-30)+2)/(2*1)

x₂=32/2

x₂=16

 

y₁=30-14

y₁=16

 

y₂=30-16

y₂=14

 

16 y 14