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Δ=3²-4*1*2=9-8=1
√Δ=1
X₁=-3-1/2=-4/2=-2
X₂=-3+1/2=-2/2=-1
w(x)=(x+2)(x+1)
b)
x=0 V x= -1/2 V x=2 V x=-2
c)
x=0 V x=1 V x=-1 V x=-7/2
d)
Δ=49-48=1
√Δ=1
X₁=7-1/2=6/2=3
X₂=7+1/2=4
x=0 V x=3 V x=4