Question

Resolva e encontre os valores de x e y
X+y=72
X.y=972

Answer 1

x=72-y
(72-y).y=972
-y²+72x=972
-y²+72x-972=0
Δ=5184-4.(-1).(-972)
Δ=5184-3888
Δ=1296→√Δ=36

x=(-72+/-36)/-2
x₁=18
x₂=54

Por nada...