p=-b/2a
q=-Δ/4a
a)
y=x²-x-2
Δ=(-1)²-4·1·(-2)
Δ=1+8
Δ=9
p=1/(2·1)=1/2
q=-9/(4·1)=-9/4=-2 1/4
b)
y=2x²-6x-2
Δ=(-6)²-4·2·(-2)
Δ=36+16
Δ=52
p=6/(2·2)=6/4=3/2=1 1/2
q=-52/(4·2)=-52/8=-13/2=-6 1/2
c)
y=-2x²+6x-4
Δ=6²-4·(-2)·(-4)
Δ=36-32
Δ=4
p=-6/(2·(-2))=-6/-4=3/2=1 1/2
q=-4/(4·(-2))=-4/-8=1/2
d)
y=-6x²-6x+8
Δ=(-6)²-4·(-6)·8
Δ=36+192
Δ=228
p=6/(2·(-6))=6/-12=-1/2
q=-228/(4·(-6))=-228/-24=19/2=9 1/2
