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a)y=-2x²+5x+7
Δ=25+4*2*7=25+56=81
b)y=2x²+3x+2
Δ=9-4*2*2=9-16=-7
c)y=-2x²+3x-1
Δ=9-4*2*1=9-8=1
d)4x²-12x+9
Δ=144-4*4*9=144-144=0
e)y=(-1/2)x²+6x-3
Δ=36-4*(1/2)*3=36-6=30
Zad 15
a)y=x²-2x+5
Δ=4-4*1*5=4-20=-16
xw=-(-2/2)=1
yw=-(-16/4)=4
b)y=x²+6x+3
Δ=36-4*1*3=36-12=24
xw=-(6/2)=-3
yw=-(24/4)=-6
c)y=x²+x-1
Δ=1+4*1*1=1+4=5
xw=-(-1/2)=1/2
yw=-(5/4)=-5/4
d)y=2x²+6x-1
Δ=36+4*2*1=36+8=44
xw=-(6/4)=-3/2
yw=-(44/8)=-11/2