Question

2) parenteses y menos 3 ao quadrado

Answer 1

(y-3)²
y²-2.y.3+3²
y²-6y+9=0
∆=b²-4ac
∆=(-6)²-4.1.9
∆=36-36
∆=0
y=-b±√∆/2a
y=-(-6)-0/2.1
y=6-0/2
y=6/2
y=3