Question

equacao do 2 grau ( y + 3 ) (y - 1)= 0

Answer 1

(y+3).(y-1)= 0
y²-y+3y-3=0
y²+2y-3=0

Δ=2²-4.1.(-3)
Δ=4+12
Δ=16

x'= -2+4 /2
x'= 2 /2
x'=1

x''= -2-4 /2
x'' -6 /2
x''= -3

S={1, -3}