Question

qual o resultado: y2 - 8 = 2Y

Answer 1

y²-8=2y
y²-2y-8=0
∆=b²-4ac
∆=(-2)²-4.1.(-8)
∆=4+32
∆=36
y=-b-/+√∆/2a
y=-(-2)-6/2.1
y=2-6/2
y=-4/2
y=-2
y=-(-2)+6/2.1
y=2+6/2
y=8/2
y=4
S={(-2, 4)}