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a=-4 b=4 c=15
Δ=b²-4ac
Δ=4²-4*(-4)*15
Δ=16+16*15
Δ=16+240=256
√Δ=16
X₁=
X₂=
X₁==2
X₂==-1
b)-x²-3x-2=0
a=- b=-3 c=-2
Δ=b²-4ac
Δ=(-3)²-4*()*(-2)
Δ=9-4=5
√Δ=√5
X₁=3-√5
X₂=3+√5
c) 3x²+2x-3=0
a=3 b=2 c=-3
Δ=2²-4*3*(-3)
Δ=4+36=40
√Δ=√40==2√10
X₁=
X₂=
d)-x²+x+1=0
a=-1 b=√3 c=1
Δ=(√3)²-4*(-1)*1
Δ=3+6=9
√Δ=3
X₁=
X₂
e) -5x²+20√5x-100=0
a=-5 b=20√5 c=-100
Δ=(-20√5)²-4*(-5)*(-100)
Δ=400*5-20*(-100)=2000+2000=4000
√Δ=√4000=
X₁=
X₂=