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x²-3x-10
x+5
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x²-x-6
(-3)do2- 4*1*(-10)=9+40=49
x1=3-7/2=-4/2=-2
x2=3+7/2=10/2=5
(-1)do2-4*1*(-6)=1+24=25
x1=1-5/2=-4/2=-2
x2=1+5/2=6/2=3