3a) 0=2x-9
2x=9
x=4,5
b) Δ= 16-4×3×(-4)=16+48=64
X1=4+8/-2= 12/-2=-6
X2=4-8/-2=-4/-2=2
4a) W(-3,-5)
b) W(4,9)
c) W(-9,-1)
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3a) 0=2x-9
2x=9
x=4,5
b) Δ= 16-4×3×(-4)=16+48=64
X1=4+8/-2= 12/-2=-6
X2=4-8/-2=-4/-2=2
4a) W(-3,-5)
b) W(4,9)
c) W(-9,-1)